/*
   Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifndef DBLQH_H
#define DBLQH_H

#ifndef DBLQH_STATE_EXTRACT
#include <pc.hpp>
#include <ndb_limits.h>
#include <SimulatedBlock.hpp>
#include <SectionReader.hpp>
#include <IntrusiveList.hpp>
#include <DLHashTable.hpp>

#include <NodeBitmask.hpp>
#include <signaldata/LCP.hpp>
#include <signaldata/LqhTransConf.hpp>
#include <signaldata/CreateTab.hpp>
#include <signaldata/LqhFrag.hpp>
#include <signaldata/FsOpenReq.hpp>
#include <signaldata/DropTab.hpp>

// primary key is stored in TUP
#include "../dbtup/Dbtup.hpp"
#include "../dbacc/Dbacc.hpp"

class Dbacc;
class Dbtup;
class Lgman;
#endif // DBLQH_STATE_EXTRACT


#define JAM_FILE_ID 450

#ifdef DBLQH_C
// Constants
/* ------------------------------------------------------------------------- */
/*       CONSTANTS USED WHEN MASTER REQUESTS STATE OF COPY FRAGMENTS.        */
/* ------------------------------------------------------------------------- */
#define ZCOPY_CLOSING 0
#define ZCOPY_ONGOING 1
#define ZCOPY_ACTIVATION 2
/* ------------------------------------------------------------------------- */
/*       STATES FOR THE VARIABLE GCP_LOG_PART_STATE                          */
/* ------------------------------------------------------------------------- */
#define ZIDLE 0
#define ZWAIT_DISK 1
#define ZON_DISK 2
#define ZACTIVE 1
/* ------------------------------------------------------------------------- */
/*       STATES FOR THE VARIABLE CSR_PHASES_STARTED                          */
/* ------------------------------------------------------------------------- */
#define ZSR_NO_PHASE_STARTED 0
#define ZSR_PHASE1_COMPLETED 1
#define ZSR_PHASE2_COMPLETED 2
#define ZSR_BOTH_PHASES_STARTED 3
/* ------------------------------------------------------------------------- */
/*       THE NUMBER OF PAGES IN A MBYTE, THE TWO LOGARITHM OF THIS.          */
/*       THE NUMBER OF MBYTES IN A LOG FILE.                                 */
/*       THE MAX NUMBER OF PAGES READ/WRITTEN FROM/TO DISK DURING            */
/*       A WRITE OR READ.                                                    */
/* ------------------------------------------------------------------------- */
#define ZNOT_DIRTY 0
#define ZDIRTY 1
#define ZREAD_AHEAD_SIZE 8
/* ------------------------------------------------------------------------- */
/*       CONSTANTS OF THE LOG PAGES                                          */
/* ------------------------------------------------------------------------- */
#define ZPAGE_HEADER_SIZE 32
#define ZPAGE_SIZE 8192
#define ZPAGES_IN_MBYTE 32
#define ZTWOLOG_NO_PAGES_IN_MBYTE 5
#define ZTWOLOG_PAGE_SIZE 13
#define ZMAX_MM_BUFFER_SIZE 32     // Main memory window during log execution

#define ZMAX_PAGES_WRITTEN 8    // Max pages before writing to disk (=> config)
#define ZMIN_READ_BUFFER_SIZE 2       // Minimum number of pages to execute log
#define ZMIN_LOG_PAGES_OPERATION 10   // Minimum no of pages before stopping

#define ZPOS_CHECKSUM 0
#define ZPOS_LOG_LAP 1
#define ZPOS_MAX_GCI_COMPLETED 2
#define ZPOS_MAX_GCI_STARTED 3
#define ZNEXT_PAGE 4
#define ZPREV_PAGE 5
#define ZPOS_VERSION 6
#define ZPOS_NO_LOG_FILES 7
#define ZCURR_PAGE_INDEX 8
#define ZLAST_LOG_PREP_REF 10
#define ZPOS_DIRTY 11
/* A number of debug items written in the page header of all log files */
#define ZPOS_LOG_TIMER 12
#define ZPOS_PAGE_I 13
#define ZPOS_PLACE_WRITTEN_FROM 14
#define ZPOS_PAGE_NO 15
#define ZPOS_PAGE_FILE_NO 16
#define ZPOS_WORD_WRITTEN 17
#define ZPOS_IN_WRITING 18
#define ZPOS_PREV_PAGE_NO 19
#define ZPOS_IN_FREE_LIST 20

/* Specify number of log parts used to enable use of more LQH threads */
#define ZPOS_NO_LOG_PARTS 21

/* ------------------------------------------------------------------------- */
/*       CONSTANTS FOR THE VARIOUS REPLICA AND NODE TYPES.                   */
/* ------------------------------------------------------------------------- */
#define ZPRIMARY_NODE 0
#define ZBACKUP_NODE 1
#define ZSTANDBY_NODE 2
#define ZTC_NODE 3
#define ZLOG_NODE 3
/* ------------------------------------------------------------------------- */
/*       VARIOUS CONSTANTS USED AS FLAGS TO THE FILE MANAGER.                */
/* ------------------------------------------------------------------------- */
#define ZVAR_NO_LOG_PAGE_WORD 1
#define ZLIST_OF_PAIRS 0
#define ZLIST_OF_PAIRS_SYNCH 16
#define ZARRAY_OF_PAGES 1
#define ZLIST_OF_MEM_PAGES 2
#define ZLIST_OF_MEM_PAGES_SYNCH 18
#define ZCLOSE_NO_DELETE 0
#define ZCLOSE_DELETE 1
#define ZPAGE_ZERO 0
/* ------------------------------------------------------------------------- */
/*       THE FOLLOWING CONSTANTS ARE USED TO DESCRIBE THE TYPES OF           */
/*       LOG RECORDS, THE SIZE OF THE VARIOUS LOG RECORD TYPES AND           */
/*       THE POSITIONS WITHIN THOSE LOG RECORDS.                             */
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
/*       THESE CONSTANTS DESCRIBE THE SIZES OF VARIOUS TYPES OF LOG REORDS.  */
/*       NEXT_LOG_SIZE IS ACTUALLY ONE. THE REASON WE SET IT TO 2 IS TO      */
/*       SIMPLIFY THE CODE SINCE OTHERWISE HAVE TO USE A SPECIAL VERSION     */
/*       OF READ_LOGWORD WHEN READING LOG RECORD TYPE                        */
/*       SINCE NEXT MBYTE TYPE COULD BE THE VERY LAST WORD IN THE MBYTE.     */
/*       BY SETTING IT TO 2 WE ENSURE IT IS NEVER THE VERY LAST WORD         */
/*       IN THE MBYTE.                                                       */
/* ------------------------------------------------------------------------- */
#define ZFD_HEADER_SIZE 3
#define ZFD_MBYTE_SIZE 3
#define ZLOG_HEAD_SIZE 8
#define ZNEXT_LOG_SIZE 2
#define ZABORT_LOG_SIZE 3
#define ZCOMMIT_LOG_SIZE 9
#define ZCOMPLETED_GCI_LOG_SIZE 2
/* ------------------------------------------------------------------------- */
/*       THESE CONSTANTS DESCRIBE THE TYPE OF A LOG RECORD.                  */
/*       THIS IS THE FIRST WORD OF A LOG RECORD.                             */
/* ------------------------------------------------------------------------- */
#define ZNEW_PREP_OP_TYPE 0
#define ZPREP_OP_TYPE 1
#define ZCOMMIT_TYPE 2
#define ZABORT_TYPE 3
#define ZFD_TYPE 4
#define ZFRAG_SPLIT_TYPE 5
#define ZNEXT_LOG_RECORD_TYPE 6
#define ZNEXT_MBYTE_TYPE 7
#define ZCOMPLETED_GCI_TYPE 8
#define ZINVALID_COMMIT_TYPE 9
/* ------------------------------------------------------------------------- */
/*       THE POSITIONS OF LOGGED DATA IN A FILE DESCRIPTOR LOG RECORD HEADER.*/
/*       ALSO THE MAXIMUM NUMBER OF FILE DESCRIPTORS IN A LOG RECORD.        */
/* ------------------------------------------------------------------------- */
#define ZPOS_LOG_TYPE 0
#define ZPOS_NO_FD 1
#define ZPOS_FILE_NO 2
/* ------------------------------------------------------------------------- */
/*       THE POSITIONS WITHIN A PREPARE LOG RECORD AND A NEW PREPARE         */
/*       LOG RECORD.                                                         */
/* ------------------------------------------------------------------------- */
#define ZPOS_HASH_VALUE 2
#define ZPOS_SCHEMA_VERSION 3
#define ZPOS_TRANS_TICKET 4
#define ZPOS_OP_TYPE 5
#define ZPOS_NO_ATTRINFO 6
#define ZPOS_NO_KEYINFO 7
/* ------------------------------------------------------------------------- */
/*       THE POSITIONS WITHIN A COMMIT LOG RECORD.                           */
/* ------------------------------------------------------------------------- */
#define ZPOS_COMMIT_TRANSID1 1
#define ZPOS_COMMIT_TRANSID2 2
#define ZPOS_COMMIT_GCI 3
#define ZPOS_COMMIT_TABLE_REF 4
#define ZPOS_COMMIT_FRAGID 5
#define ZPOS_COMMIT_FILE_NO 6
#define ZPOS_COMMIT_START_PAGE_NO 7
#define ZPOS_COMMIT_START_PAGE_INDEX 8
#define ZPOS_COMMIT_STOP_PAGE_NO 9
/* ------------------------------------------------------------------------- */
/*       THE POSITIONS WITHIN A ABORT LOG RECORD.                            */
/* ------------------------------------------------------------------------- */
#define ZPOS_ABORT_TRANSID1 1
#define ZPOS_ABORT_TRANSID2 2
/* ------------------------------------------------------------------------- */
/*       THE POSITION WITHIN A COMPLETED GCI LOG RECORD.                     */
/* ------------------------------------------------------------------------- */
#define ZPOS_COMPLETED_GCI 1
/* ------------------------------------------------------------------------- */
/*       THE POSITIONS WITHIN A NEW PREPARE LOG RECORD.                      */
/* ------------------------------------------------------------------------- */
#define ZPOS_NEW_PREP_FILE_NO 8
#define ZPOS_NEW_PREP_PAGE_REF 9

#define ZLAST_WRITE_IN_FILE 1
#define ZENFORCE_WRITE 2
/* ------------------------------------------------------------------------- */
/*       CONSTANTS USED AS INPUT TO SUBROUTINE WRITE_LOG_PAGES AMONG OTHERS. */
/* ------------------------------------------------------------------------- */
#define ZNORMAL 0
#define ZINIT 1
/* ------------------------------------------------------------------------- */
/*       CONSTANTS USED BY CONTINUEB TO DEDUCE WHICH CONTINUE SIGNAL IS TO   */
/*       BE EXECUTED AS A RESULT OF THIS CONTINUEB SIGNAL.                   */
/* ------------------------------------------------------------------------- */
#define ZLOG_LQHKEYREQ 0
#define ZPACK_LQHKEYREQ 1
#define ZSEND_ATTRINFO 2
#define ZSR_GCI_LIMITS 3
#define ZSR_LOG_LIMITS 4
#define ZSEND_EXEC_CONF 5
#define ZEXEC_SR 6
#define ZSR_FOURTH_COMP 7
#define ZINIT_FOURTH 8
#define ZTIME_SUPERVISION 9
#define ZSR_PHASE3_START 10
#define ZLQH_TRANS_NEXT 11
#define ZLQH_RELEASE_AT_NODE_FAILURE 12
#define ZSCAN_TC_CONNECT 13
#define ZINITIALISE_RECORDS 14
#define ZINIT_GCP_REC 15
#define ZCHECK_LCP_STOP_BLOCKED 17
#define ZSCAN_MARKERS 18
#define ZOPERATION_EVENT_REP 19
#define ZDROP_TABLE_WAIT_USAGE 20
#define ZENABLE_EXPAND_CHECK 21
#define ZRETRY_TCKEYREF 22
#define ZWAIT_REORG_SUMA_FILTER_ENABLED 23
#define ZREBUILD_ORDERED_INDEXES 24
#define ZWAIT_READONLY 25
#define ZLCP_FRAG_WATCHDOG 26

/* ------------------------------------------------------------------------- */
/*        NODE STATE DURING SYSTEM RESTART, VARIABLES CNODES_SR_STATE        */
/*        AND CNODES_EXEC_SR_STATE.                                          */
/* ------------------------------------------------------------------------- */
#define ZSTART_SR 1
#define ZEXEC_SR_COMPLETED 2
/* ------------------------------------------------------------------------- */
/*       CONSTANTS USED BY NODE STATUS TO DEDUCE THE STATUS OF A NODE.       */
/* ------------------------------------------------------------------------- */
#define ZNODE_UP 0
#define ZNODE_DOWN 1
/* ------------------------------------------------------------------------- */
/*       START PHASES                                                        */
/* ------------------------------------------------------------------------- */
#define ZLAST_START_PHASE 255
#define ZSTART_PHASE1 1
#define ZSTART_PHASE2 2
#define ZSTART_PHASE3 3
#define ZSTART_PHASE4 4
#define ZSTART_PHASE6 6
/* ------------------------------------------------------------------------- */
/*       CONSTANTS USED BY SCAN AND COPY FRAGMENT PROCEDURES                 */
/* ------------------------------------------------------------------------- */
#define ZSTORED_PROC_SCAN 0
#define ZSTORED_PROC_COPY 2
#define ZDELETE_STORED_PROC_ID 3
#define ZWRITE_LOCK 1
#define ZSCAN_FRAG_CLOSED 2
/* ------------------------------------------------------------------------- */
/*       ERROR CODES ADDED IN VERSION 0.1 AND 0.2                            */
/* ------------------------------------------------------------------------- */
#define ZNOT_FOUND 1             // Not an error code, a return value
#define ZNO_FREE_LQH_CONNECTION 414
#define ZGET_DATAREC_ERROR 418
#define ZGET_ATTRINBUF_ERROR 419
#define ZNO_FREE_FRAGMENTREC 460 // Insert new fragment error code
#define ZTAB_FILE_SIZE 464       // Insert new fragment error code + Start kernel
#define ZNO_ADD_FRAGREC 465      // Insert new fragment error code
/* ------------------------------------------------------------------------- */
/*       ERROR CODES ADDED IN VERSION 0.3                                    */
/* ------------------------------------------------------------------------- */
#define ZTAIL_PROBLEM_IN_LOG_ERROR 410
#define ZGCI_TOO_LOW_ERROR 429        // GCP_SAVEREF error code
#define ZTAB_STATE_ERROR 474          // Insert new fragment error code
#define ZTOO_NEW_GCI_ERROR 479        // LCP Start error
/* ------------------------------------------------------------------------- */
/*       ERROR CODES ADDED IN VERSION 0.4                                    */
/* ------------------------------------------------------------------------- */

#define ZNO_FREE_FRAG_SCAN_REC_ERROR 490 // SCAN_FRAGREF error code
#define ZCOPY_NO_FRAGMENT_ERROR 491      // COPY_FRAGREF error code
#define ZTAKE_OVER_ERROR 499
#define ZCOPY_NODE_ERROR 1204
#define ZTOO_MANY_COPY_ACTIVE_ERROR 1208 // COPY_FRAG and COPY_ACTIVEREF code
#define ZCOPY_ACTIVE_ERROR 1210          // COPY_ACTIVEREF error code
#define ZNO_TC_CONNECT_ERROR 1217        // Simple Read + SCAN
#define ZTRANSPORTER_OVERLOADED_ERROR 1218
/* ------------------------------------------------------------------------- */
/*       ERROR CODES ADDED IN VERSION 1.X                                    */
/* ------------------------------------------------------------------------- */
//#define ZSCAN_BOOK_ACC_OP_ERROR 1219   // SCAN_FRAGREF error code
#define ZFILE_CHANGE_PROBLEM_IN_LOG_ERROR 1220
#define ZTEMPORARY_REDO_LOG_FAILURE 1221
#define ZNO_FREE_MARKER_RECORDS_ERROR 1222
#define ZNODE_SHUTDOWN_IN_PROGRESS 1223
#define ZTOO_MANY_FRAGMENTS 1224
#define ZTABLE_NOT_DEFINED 1225
#define ZDROP_TABLE_IN_PROGRESS 1226
#define ZINVALID_SCHEMA_VERSION 1227
#define ZTABLE_READ_ONLY 1233
#define ZREDO_IO_PROBLEM 1234

/* ------------------------------------------------------------------------- */
/*       ERROR CODES ADDED IN VERSION 2.X                                    */
/* ------------------------------------------------------------------------- */
#define ZNODE_FAILURE_ERROR 400
#define ZBAD_UNLOCK_STATE 416
#define ZBAD_OP_REF 417
/* ------------------------------------------------------------------------- */
/*       ERROR CODES FROM ACC                                                */
/* ------------------------------------------------------------------------- */
#define ZNO_TUPLE_FOUND 626
#define ZTUPLE_ALREADY_EXIST 630
/* ------------------------------------------------------------------------- */
/*       ERROR CODES FROM TUP                                                */
/* ------------------------------------------------------------------------- */
/** 
 * 899 would be returned by an interpreted program such as a scan filter. New
 * such programs should use 626 instead, but 899 will also be supported to 
 * remain backwards compatible. 899 is problematic since it is also used as
 * "Rowid already allocated" (cf. ndberror.c).
 */
#define ZUSER_SEARCH_CONDITION_FALSE_CODE 899
#endif

/** 
 * @class dblqh
 *
 * @section secIntro Introduction
 *
 * Dblqh is the coordinator of the LDM.  Dblqh is responsible for 
 * performing operations on tuples.  It does this job with help of 
 * Dbacc block (that manages the index structures) and Dbtup
 * (that manages the tuples).
 *
 * Dblqh also keeps track of the participants and acts as a coordinator of
 * 2-phase commits.  Logical redo logging is also handled by the Dblqh
 * block.
 *
 * @section secModules Modules
 *
 * The code is partitioned into the following modules:
 * - START / RESTART 
 *   - Start phase 1: Load our block reference and our processor id
 *   - Start phase 2: Initiate all records within the block
 *                    Connect LQH with ACC and TUP.
 *   - Start phase 4: Connect LQH with LQH.  Connect every LQH with 
 *                    every LQH in the database system.           
 *	              If initial start, then create the fragment log files.
 *	              If system restart or node restart, 
 *                    then open the fragment log files and   
 *	              find the end of the log files.
 * - ADD / DELETE FRAGMENT<br>
 *     Used by dictionary to create new fragments and delete old fragments.
 *  - EXECUTION<br>
 *    handles the reception of lqhkeyreq and all processing        
 *    of operations on behalf of this request. 
 *    This does also involve reception of various types of attrinfo 
 *    and keyinfo. 
 *    It also involves communication with ACC and TUP.
 *  - LOG<br>
 *    The log module handles the reading and writing of the log.
 *    It is also responsible for handling system restart. 
 *    It controls the system restart in TUP and ACC as well.
 *  - TRANSACTION<br>
 *    This module handles the commit and the complete phases.
 *  - MODULE TO HANDLE TC FAILURE<br>
 *  - SCAN<br>
 *    This module contains the code that handles a scan of a particular 
 *    fragment.
 *    It operates under the control of TC and orders ACC to 
 *    perform a scan of all tuples in the fragment.
 *    TUP performs the necessary search conditions
 *    to ensure that only valid tuples are returned to the application.
 *  - NODE RECOVERY<br>
 *    Used when a node has failed. 
 *    It performs a copy of a fragment to a new replica of the fragment. 
 *    It does also shut down all connections to the failed node.
 *  - LOCAL CHECKPOINT<br>
 *    Handles execution and control of LCPs
 *    It controls the LCPs in TUP and ACC. 
 *    It also interacts with DIH to control which GCPs are recoverable.
 *  - GLOBAL CHECKPOINT<br>
 *    Helps DIH in discovering when GCPs are recoverable. 
 *    It handles the request gcp_savereq that requests LQH to 
 *    save a particular GCP to disk and respond when completed.  
 *  - FILE HANDLING<br>
 *    With submodules: 
 *    - SIGNAL RECEPTION
 *    - NORMAL OPERATION
 *    - FILE CHANGE
 *    - INITIAL START
 *    - SYSTEM RESTART PHASE ONE
 *    - SYSTEM RESTART PHASE TWO,
 *    - SYSTEM RESTART PHASE THREE
 *    - SYSTEM RESTART PHASE FOUR
 *  - ERROR 
 *  - TEST 
 *  - LOG 
 */
class Dblqh 
#ifndef DBLQH_STATE_EXTRACT
  : public SimulatedBlock
#endif
{
  friend class DblqhProxy;

public:
#ifndef DBLQH_STATE_EXTRACT
  enum LcpCloseState {
    LCP_IDLE = 0,
    LCP_RUNNING = 1,       // LCP is running
    LCP_CLOSE_STARTED = 2, // Completion(closing of files) has started
    ACC_LCP_CLOSE_COMPLETED = 3,
    TUP_LCP_CLOSE_COMPLETED = 4
  };

  enum ExecUndoLogState {
    EULS_IDLE = 0,
    EULS_STARTED = 1,
    EULS_COMPLETED = 2
  };

  struct AddFragRecord {
    enum AddFragStatus {
      FREE = 0,
      ACC_ADDFRAG = 1,
      WAIT_TUP = 3,
      WAIT_TUX = 5,
      WAIT_ADD_ATTR = 6,
      TUP_ATTR_WAIT = 7,
      TUX_ATTR_WAIT = 9
    };
    AddFragStatus addfragStatus;
    UintR fragmentPtr;
    UintR nextAddfragrec;
    UintR accConnectptr;
    UintR tupConnectptr;
    UintR tuxConnectptr;

    CreateTabReq m_createTabReq;
    LqhFragReq m_lqhFragReq;
    LqhAddAttrReq m_addAttrReq;
    DropFragReq m_dropFragReq;
    DropTabReq m_dropTabReq;

    Uint16 addfragErrorCode;
    Uint16 attrSentToTup;
    Uint16 attrReceived;
    Uint16 totalAttrReceived;
    Uint16 fragCopyCreation;
    Uint16 defValNextPos;
    Uint32 defValSectionI;
  };
  typedef Ptr<AddFragRecord> AddFragRecordPtr;
  
  struct ScanRecord {
    ScanRecord() {}
    enum ScanState {
      SCAN_FREE = 0,
      WAIT_STORED_PROC_COPY = 1,
      WAIT_STORED_PROC_SCAN = 2,
      WAIT_NEXT_SCAN_COPY = 3,
      WAIT_NEXT_SCAN = 4,
      WAIT_DELETE_STORED_PROC_ID_SCAN = 5,
      WAIT_DELETE_STORED_PROC_ID_COPY = 6,
      WAIT_ACC_COPY = 7,
      WAIT_ACC_SCAN = 8,
      WAIT_SCAN_NEXTREQ = 10,
      WAIT_CLOSE_SCAN = 12,
      WAIT_CLOSE_COPY = 13,
      WAIT_RELEASE_LOCK = 14,
      WAIT_TUPKEY_COPY = 15,
      WAIT_LQHKEY_COPY = 16,
      IN_QUEUE = 17
    };
    enum ScanType {
      ST_IDLE = 0,
      SCAN = 1,
      COPY = 2
    };

    /* A single scan of each fragment can have MAX_PARALLEL_OP_PER_SCAN
     * read operations in progress at one time
     * We must store ACC ptrs for each read operation.  They are stored
     * in SegmentedSections linked in the array below.
     * The main oddity is that the first element of scan_acc_op_ptr is
     * an ACC ptr, but all others are refs to SectionSegments containing
     * ACC ptrs.
     */
    STATIC_CONST( MaxScanAccSegments= (
                 (MAX_PARALLEL_OP_PER_SCAN + SectionSegment::DataLength - 1) /
                 SectionSegment::DataLength) + 1);

    UintR scan_acc_op_ptr[ MaxScanAccSegments ];
    Uint32 scan_acc_index;
    Uint32 scan_acc_segments;
    UintR scanApiOpPtr;
    Local_key m_row_id;
    
    Uint32 m_max_batch_size_rows;
    Uint32 m_max_batch_size_bytes;

    Uint32 m_curr_batch_size_rows;
    Uint32 m_curr_batch_size_bytes;

    bool check_scan_batch_completed() const;
    
    UintR copyPtr;
    union {
      Uint32 nextPool;
      Uint32 nextList;
    };
    Uint32 prevList;
    Uint32 nextHash;
    Uint32 prevHash;
    bool equal(const ScanRecord & key) const {
      return scanNumber == key.scanNumber && fragPtrI == key.fragPtrI;
    }
    Uint32 hashValue() const {
      return fragPtrI ^ scanNumber;
    }
    
    UintR scanAccPtr;
    UintR scanAiLength;
    UintR scanErrorCounter;
    UintR scanSchemaVersion;
    Uint32 scanTcWaiting; // When the request came from TC, 0 is no request

    /**
     * This is _always_ main table, even in range scan
     *   in which case scanTcrec->fragmentptr is different
     */
    Uint32 fragPtrI;
    UintR scanStoredProcId;
    ScanState scanState;
    UintR scanTcrec;
    ScanType scanType;
    BlockReference scanApiBlockref;
    NodeId scanNodeId;
    Uint16 scanReleaseCounter;
    Uint16 scanNumber;

    // scan source block ACC TUX TUP
    BlockReference scanBlockref;
 
    Uint8 scanCompletedStatus;
    Uint8 scanFlag;
    Uint8 scanLockHold;
    Uint8 scanLockMode;
    Uint8 readCommitted;
    Uint8 rangeScan;
    Uint8 descending;
    Uint8 tupScan;
    Uint8 lcpScan;
    Uint8 scanKeyinfoFlag;
    Uint8 m_last_row;
    Uint8 m_reserved;
    Uint8 statScan;
    Uint8 m_stop_batch;
    Uint8 dummy[2]; // align?
  }; // Size 272 bytes
  typedef Ptr<ScanRecord> ScanRecordPtr;

  struct Fragrecord {
    Fragrecord() {}

    enum ExecSrStatus {
      IDLE = 0,
      ACTIVE = 2
    };
    /**
     * Possible state transitions are:
     * - FREE -> DEFINED                 Fragment record is allocated
     * - DEFINED -> ACTIVE               Add fragment is completed and 
     *                                   fragment is ready to      
     *                                   receive operations.
     * - DEFINED -> ACTIVE_CREATION      Add fragment is completed and 
     *                                   fragment is ready to      
     *                                   receive operations in parallel 
     *                                   with a copy fragment     
     *                                   which is performed from the 
     *                                   primary replica             
     * - DEFINED -> CRASH_RECOVERING     A fragment is ready to be 
     *                                   recovered from a local        
     *                                   checkpoint on disk
     * - ACTIVE -> BLOCKED               A local checkpoint is to be 
     *                                   started.  No more operations 
     *                                   are allowed to be started until 
     *                                   the local checkpoint    
     *                                   has been started.
     * - ACTIVE -> REMOVING              A fragment is removed from the node
     * - BLOCKED -> ACTIVE               Operations are allowed again in 
     *                                   the fragment.           
     * - CRASH_RECOVERING -> ACTIVE      A fragment has been recovered and 
     *                                   are now ready for     
     *                                   operations again.
     * - CRASH_RECOVERING -> REMOVING    Fragment recovery failed or 
     *                                   was cancelled.              
     * - ACTIVE_CREATION -> ACTIVE       A fragment is now copied and now 
     *                                   is a normal fragment   
     * - ACTIVE_CREATION -> REMOVING     Copying of the fragment failed
     * - REMOVING -> FREE                Removing of the fragment is 
     *                                   completed and the fragment  
     *                                   is now free again.
     */
    enum FragStatus {
      FREE = 0,               ///< Fragment record is currently not in use
      FSACTIVE = 1,           ///< Fragment is defined and usable for operations
      DEFINED = 2,            ///< Fragment is defined but not yet usable by 
                              ///< operations
      BLOCKED = 3,            ///< LQH is waiting for all active operations to 
                              ///< complete the current phase so that the 
                              ///< local checkpoint can be started.
      ACTIVE_CREATION = 4,    ///< Fragment is defined and active but is under 
                              ///< creation by the primary LQH.
      CRASH_RECOVERING = 5,   ///< Fragment is recovering after a crash by 
                              ///< executing the fragment log and so forth. 
                              ///< Will need further breakdown.
      REMOVING = 6            ///< The fragment is currently removed. 
                              ///< Operations are not allowed. 
    };
    enum LogFlag {
      STATE_TRUE = 0,
      STATE_FALSE = 1
    };
    enum SrStatus {
      SS_IDLE = 0,
      SS_STARTED = 1,
      SS_COMPLETED = 2
    };
    enum LcpFlag {
      LCP_STATE_TRUE = 0,
      LCP_STATE_FALSE = 1
    };
    /**
     *        Last GCI for executing the fragment log in this phase.
     */
    UintR execSrLastGci[4];
    /**
     *       Start GCI for executing the fragment log in this phase.
     */
    UintR execSrStartGci[4];
    /**
     *       Requesting user pointer for executing the fragment log in
     *       this phase
     */
    UintR execSrUserptr[4];
    /**
     *       The LCP identifier of the LCP's. 
     *       =0 means that the LCP number has not been stored.
     *       The LCP identifier is supplied by DIH when starting the LCP.   
     */
    UintR lcpId[MAX_LCP_STORED];
    UintR maxGciInLcp;
    /**
     *       This variable contains the maximum global checkpoint 
     *       identifier that exists in a certain local checkpoint. 
     *       Maximum 4 local checkpoints is possible in this release.
     */
    UintR maxGciCompletedInLcp;
    UintR srLastGci[4];
    UintR srStartGci[4];
    /**
     *       The fragment pointers in ACC
     */
    UintR accFragptr;
    /**
     *       The EXEC_SR variables are used to keep track of which fragments  
     *       that are interested in being executed as part of executing the    
     *       fragment loop. 
     *       It is initialised for every phase of executing the 
     *       fragment log (the fragment log can be executed upto four times).  
     *                                                                         
     *       Each execution is capable of executing the log records on four    
     *       fragment replicas.                                                
     */
    /**
     *       Requesting block reference for executing the fragment log
     *       in this phase.
     */
    BlockReference execSrBlockref[4];
    /**
     *       This variable contains references to active scan and copy     
     *       fragment operations on the fragment. 
     *       A maximum of four concurrently active is allowed.
     */

    typedef Bitmask<8> ScanNumberMask; // Max 255 KeyInfo20::ScanNo
    ScanNumberMask m_scanNumberMask;
    DLList<ScanRecord>::Head m_activeScans;
    DLFifoList<ScanRecord>::Head m_queuedScans;
    DLFifoList<ScanRecord>::Head m_queuedTupScans;

    Uint16 srLqhLognode[4];
    /**
     *       The fragment pointers in TUP and TUX
     */
    UintR tupFragptr;
    UintR tuxFragptr;

    /**
     *       This variable keeps track of how many operations that are 
     *       active that have skipped writing the log but not yet committed 
     *       or aborted.  This is used during start of fragment.
     */
    UintR activeTcCounter;

    /**
     *       This status specifies whether this fragment is actively 
     *       engaged in executing the fragment log.
     */
    ExecSrStatus execSrStatus;

    /**
     *       The fragment id of this fragment.
     */
    UintR fragId;

    /**
     *       Status of fragment
     */
    FragStatus fragStatus;

    /**
     * 0 = undefined i.e fragStatus != ACTIVE_CREATION
     * 1 = yes
     * 2 = no
     */
    enum ActiveCreat {
      AC_NORMAL = 0,  // fragStatus != ACTIVE_CREATION
      AC_IGNORED = 1, // Operation that got ignored during NR
      AC_NR_COPY = 2  // Operation that got performed during NR
    };
    Uint8 m_copy_started_state; 

    /**
     *       This flag indicates whether logging is currently activated at 
     *       the fragment.  
     *       During a system restart it is temporarily shut off. 
     *       Some fragments have it permanently shut off. 
     */
    LogFlag logFlag;
    UintR masterPtr;
    /**
     *       This variable contains the maximum global checkpoint identifier 
     *       which was completed when the local checkpoint was started.
     */
    /**
     *       Reference to the next fragment record in a free list of fragment 
     *       records.              
     */
    union {
      Uint32 nextPool;
      Uint32 nextList;
    };
    Uint32 prevList;
    
    /**
     *       The newest GCI that has been committed on fragment             
     */
    UintR newestGci;
    SrStatus srStatus;
    UintR srUserptr;
    /**
     *       The starting global checkpoint of this fragment.
     */
    UintR startGci;
    /**
     *       A reference to the table owning this fragment.
     */
    UintR tabRef;

    /**
     *       This is the queue to put operations that have been blocked 
     *       during start of a local chkp.
     */
    UintR firstWaitQueue;
    UintR lastWaitQueue;

    /**
     *       The block reference to ACC on the fragment makes it
     *       possible to have different ACC blocks for different
     *       fragments in the future.
     */
    BlockReference accBlockref;

    /**
     *       Ordered index block.
     */
    BlockReference tuxBlockref;
    /**
     *       The master block reference as sent in COPY_ACTIVEREQ.
     */
    BlockReference masterBlockref;
    /**
     *       These variables are used during system restart to recall
     *       from which node to execute the fragment log and which GCI's
     *       this node should start and stop from. Also to remember who
     *       to send the response to when system restart is completed.
     */
    BlockReference srBlockref;
    /**
     *       The block reference to TUP on the fragment makes it
     *       possible to have different TUP blocks for different
     *       fragments in the future.
     */
    BlockReference tupBlockref;
    /**
     *      This state indicates if the fragment will participate in a
     *      checkpoint.  
     *      Temporary tables with Fragrecord::logFlag permanently off
     *      will also have Fragrecord::lcpFlag off.
     */
    LcpFlag lcpFlag;
    /**
     *       Used to ensure that updates started with old
     *       configuration do not arrive here after the copy fragment
     *       has started. 
     *       If they are allowed to arrive after they
     *       could update a record that has already been replicated to
     *       the new node.  This type of arrival should be extremely
     *       rare but we must anyway ensure that no harm is done.
     */
    Uint16 copyNode;
    /**
     *       This variable ensures that only one copy fragment is
     *       active at a time on the fragment.
     */
    Uint8 copyFragState;
    /**
     *       The number of fragment replicas that will execute the log
     *       records in this round of executing the fragment
     *       log.  Maximum four is possible.
     */
    Uint8 execSrNoReplicas;
    /**
     *       This variable contains what type of replica this fragment
     *       is.  Two types are possible:  
     *       - Primary/Backup replica = 0
     *       - Stand-by replica = 1 
     *
     *       It is not possible to distinguish between primary and
     *       backup on a fragment.  
     *       This can only be done per transaction. 
     *       DIH can change from primary to backup without informing
     *       the various replicas about this change.
     */
    Uint8 fragCopy;
    /**
     *       This is the last fragment distribution key that we have
     *       heard of.
     */
    Uint8 fragDistributionKey;
   /**
     *       How many local checkpoints does the fragment contain
     */
    Uint8 srChkpnr;
    Uint8 srNoLognodes;
    /**
     *       Table type.
     */
    Uint8 tableType;
    /**
     *       For ordered index fragment, i-value of corresponding
     *       fragment in primary table.
     */
    UintR tableFragptr;

    /**
     * Log part
     */
    Uint32 m_log_part_ptr_i;

    /**
     * Instance key for fast access.
     */
    Uint16 lqhInstanceKey;
  };
  typedef Ptr<Fragrecord> FragrecordPtr;
  
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$                GLOBAL CHECKPOINT RECORD                  $$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**
   *       This record describes a global checkpoint that is
   *       completed.  It waits for all log records belonging to this
   *       global checkpoint to be saved on disk.
   */
  struct GcpRecord {
    /**
     *       The file number within each log part where the log was
     *       located when gcp_savereq was received. The last record 
     *       belonging to this global checkpoint is certainly before 
     *       this place in the log. We could come even closer but it 
     *       would cost performance and doesn't seem like a good 
     *       idea. This is simple and it works.
     */
    Uint16 gcpFilePtr[NDB_MAX_LOG_PARTS];
    /** 
     *       The page number within the file for each log part.
     */
    Uint16 gcpPageNo[NDB_MAX_LOG_PARTS];
    /**
     *       The word number within the last page that was written for
     *       each log part.
     */
    Uint16 gcpWordNo[NDB_MAX_LOG_PARTS];
    /**
     *       The identity of this global checkpoint.
     */
    UintR gcpId;
    /**
     *       The state of this global checkpoint, one for each log part.
     */
    Uint8 gcpLogPartState[NDB_MAX_LOG_PARTS];
    /**
     *       The sync state of this global checkpoint, one for each
     *       log part.
     */
    Uint8 gcpSyncReady[NDB_MAX_LOG_PARTS];
    /**
     *       User pointer of the sender of gcp_savereq (= master DIH).
     */
    UintR gcpUserptr;
    /**
     *       Block reference of the sender of gcp_savereq 
     *       (= master DIH).
     */
    BlockReference gcpBlockref;
  }; // Size 44 bytes
  typedef Ptr<GcpRecord> GcpRecordPtr;

  struct HostRecord {
    struct PackedWordsContainer lqh_pack[MAX_NDBMT_LQH_THREADS+1];
    struct PackedWordsContainer tc_pack[MAX_NDBMT_TC_THREADS+1];
    Uint8 inPackedList;
    Uint8 nodestatus;
  };
  typedef Ptr<HostRecord> HostRecordPtr;
  
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$               LOCAL CHECKPOINT SUPPORT RECORD            $$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**
   *      This record contains the information about an outstanding
   *      request to TUP or ACC. Used for both local checkpoints and
   *      system restart.
   */
  struct LcpLocRecord {
    enum LcpLocstate {
      IDLE = 0,
      WAIT_TUP_PREPLCP = 1,
      WAIT_LCPHOLDOP = 2,
      HOLDOP_READY = 3,
      ACC_WAIT_STARTED = 4,
      ACC_STARTED = 5,
      ACC_COMPLETED = 6,
      TUP_WAIT_STARTED = 7,
      TUP_STARTED = 8,
      TUP_COMPLETED = 9,
      SR_ACC_STARTED = 10,
      SR_TUP_STARTED = 11,
      SR_ACC_COMPLETED = 12,
      SR_TUP_COMPLETED = 13
    };
    LcpLocstate lcpLocstate;
    Uint32 lcpRef;
  }; // 28 bytes
  typedef Ptr<LcpLocRecord> LcpLocRecordPtr;

  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$              LOCAL CHECKPOINT RECORD                    $$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /** 
   *       This record contains the information about a local
   *       checkpoint that is ongoing. This record is also used as a
   *       system restart record.
   */
  struct LcpRecord {
    LcpRecord() { m_EMPTY_LCP_REQ.clear(); }
    
    enum LcpState {
      LCP_IDLE = 0,
      LCP_COMPLETED = 2,
      LCP_WAIT_FRAGID = 3,
      LCP_WAIT_TUP_PREPLCP = 4,
      LCP_WAIT_HOLDOPS = 5,
      LCP_START_CHKP = 7,
      LCP_BLOCKED_COMP = 8,
      LCP_SR_WAIT_FRAGID = 9,
      LCP_SR_STARTED = 10,
      LCP_SR_COMPLETED = 11
    };
 
    LcpState lcpState;
    bool firstFragmentFlag;
    bool lastFragmentFlag;

    struct FragOrd {
      Uint32 fragPtrI;
      LcpFragOrd lcpFragOrd;
    };
    FragOrd currentFragment;
    
    bool   lcpQueued;
    FragOrd queuedFragment;
    
    bool   reportEmpty;
    NdbNodeBitmask m_EMPTY_LCP_REQ;

    Uint32 m_error;
    Uint32 m_outstanding;
  }; // Size 76 bytes
  typedef Ptr<LcpRecord> LcpRecordPtr;

  struct IOTracker
  {
    STATIC_CONST( SAMPLE_TIME = 128 );              // millis
    STATIC_CONST( SLIDING_WINDOW_LEN = 1024 );      // millis
    STATIC_CONST( SLIDING_WINDOW_HISTORY_LEN = 8 );

    void init(Uint32 partNo);
    Uint32 m_log_part_no;
    Uint32 m_current_time;

    /**
     * Keep sliding window of measurement
     */
    Uint32 m_save_pos; // current pos in array
    Uint32 m_save_written_bytes[SLIDING_WINDOW_HISTORY_LEN];
    Uint32 m_save_elapsed_millis[SLIDING_WINDOW_HISTORY_LEN];

    /**
     * Current sum of sliding window
     */
    Uint32 m_curr_written_bytes;
    Uint32 m_curr_elapsed_millis;

    /**
     * Currently outstanding bytes
     */
    Uint32 m_sum_outstanding_bytes;

    /**
     * How many times did we pass lag-threshold
     */
    Uint32 m_lag_cnt;

    /**
     * bytes send during current sample
     */
    Uint32 m_sample_sent_bytes;

    /**
     * bytes completed during current sample
     */
    Uint32 m_sample_completed_bytes;

    int tick(Uint32 now, Uint32 maxlag, Uint32 maxlag_cnt);
    void send_io(Uint32 bytes);
    void complete_io(Uint32 bytes);
  };

  /**
   * LCPFragWatchdog
   *
   * Structure tracking state of LCP fragment watchdog.
   * This watchdog polls the state of the current LCP fragment
   * scan to ensure that forward progress is maintained at
   * a minimal rate.
   * It only continues running while this LQH instance 
   * thinks a fragment scan is ongoing
   */
  struct LCPFragWatchdog
  {
    STATIC_CONST( PollingPeriodMillis = 10000 ); /* 10s */
    Uint32 WarnElapsedWithNoProgressMillis; /* LCP Warn, milliseconds */
    Uint32 MaxElapsedWithNoProgressMillis;  /* LCP Fail, milliseconds */

    SimulatedBlock* block;
    
    /* Should the watchdog be running? */
    bool scan_running;
    
    /* Is there an active thread? */
    bool thread_active;
    
    /* LCP position and state info from Backup block */
    LcpStatusConf::LcpState lcpState;
    Uint32 tableId;
    Uint32 fragId;
    Uint64 completionStatus;
    Uint32 lcpScannedPages;

    /* Total elapsed milliseconds with no LCP progress observed */ 
    Uint32 elapsedNoProgressMillis; /* milliseconds */
    NDB_TICKS lastChecked;          /* Last time LCP progress checked */

    /* Reinitialise the watchdog */
    void reset();

    /* Handle an LCP Status report */
    void handleLcpStatusRep(LcpStatusConf::LcpState repLcpState,
                            Uint32 repTableId,
                            Uint32 repFragId,
                            Uint64 repCompletionStatus,
                            Uint32 repLcpScannedPages);
  };
  
  LCPFragWatchdog c_lcpFragWatchdog;
    
    
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /*                                                                          */
  /*       THE RECORDS THAT START BY LOG_ ARE A PART OF THE LOG MANAGER.      */
  /*       THESE RECORDS ARE USED TO HANDLE THE FRAGMENT LOG.                 */
  /*                                                                          */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$                       LOG RECORD                         $$$$$$$ */
  /*                                                                          */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /*       THIS RECORD IS ALIGNED TO BE 256 BYTES.                            */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**       
   *       This record describes the current state of a log. 
   *       A log consists of a number of log files. 
   *       These log files are described by the log file record.
   *
   *       There will be 4 sets of log files. 
   *       Different tables will use different log files dependent 
   *       on the table id. 
   *       This  ensures that more than one outstanding request can 
   *       be sent to the file system.
   *       The log file to use is found by performing a very simple hash
   *       function.
   */
  struct LogPartRecord {
    enum LogPartState {
      IDLE = 0,                       ///< Nothing happens at the moment
      ACTIVE = 1,                     ///< An operation is active logging 
      SR_FIRST_PHASE = 2,             ///< Finding the end of the log and 
                                      ///< the information about global 
                                      ///< checkpoints in the log is ongoing.
      SR_FIRST_PHASE_COMPLETED = 3,   ///< First phase completed
      SR_THIRD_PHASE_STARTED = 4,     ///< Executing fragment log is in 3rd ph
      SR_THIRD_PHASE_COMPLETED = 5,
      SR_FOURTH_PHASE_STARTED = 6,    ///< Finding the log tail and head 
                                      ///< is the fourth phase.
      SR_FOURTH_PHASE_COMPLETED = 7
    };
    enum WaitWriteGciLog {
      WWGL_TRUE = 0,
      WWGL_FALSE = 1
    };
    enum LogExecState {
      LES_IDLE = 0,
      LES_SEARCH_STOP = 1,
      LES_SEARCH_START = 2,
      LES_EXEC_LOG = 3,
      LES_EXEC_LOG_NEW_MBYTE = 4,
      LES_EXEC_LOG_NEW_FILE = 5,
      LES_EXEC_LOGREC_FROM_FILE = 6,
      LES_EXEC_LOG_COMPLETED = 7,
      LES_WAIT_READ_EXEC_SR_NEW_MBYTE = 8,
      LES_WAIT_READ_EXEC_SR = 9,
      LES_EXEC_LOG_INVALIDATE = 10
    };

    /**
     *       Is a CONTINUEB(ZLOG_LQHKEYREQ) signal sent and
     *       outstanding. We do not want several instances of this
     *       signal out in the air since that would create multiple
     *       writers of the list.
     */
    UintR LogLqhKeyReqSent;
    /**
     *       Contains the current log file where log records are
     *       written.  During system restart it is used to indicate the
     *       last log file.
     */
    UintR currentLogfile;
    /**
     *       The log file used to execute log records from far behind.
     */
    UintR execSrExecLogFile;
    /**
     *       The currently executing prepare record starts in this log
     *       page. This variable is used to enable that a log record is
     *       executed multiple times in execution of the log.
     */
    UintR execSrLogPage;
    /**
     *       This variable keeps track of the lfo record where the
     *       pages that were read from disk when an operations log
     *       record were not found in the main memory buffer for log
     *       pages.
     */
    UintR execSrLfoRec;
    /**
     *       The starting page number when reading log from far behind.
     */
    UintR execSrStartPageNo;
    /**
     *       The last page number when reading log from far behind.
     */
    UintR execSrStopPageNo;
    /**
     *       Contains a reference to the first log file, file number 0.
     */
    UintR firstLogfile;
    /** 
     *       This variable contains the oldest operation in this log
     *       part which have not been committed yet.
     */
    UintR firstLogTcrec;
    /**
     *       The first reference to a set of 8 pages. These are used
     *       during execution of the log to keep track of which pages
     *       are in memory and which are not.
     */
    UintR firstPageRef;
    /**
     *       This variable contains the global checkpoint record
     *       waiting for disk writes to complete.
     */
    UintR gcprec;
    /**
     *       The last reference to a set of 8 pages.  These are used
     *       during execution of the log to keep track of which pages
     *       are in memory and which are not.
     */
    UintR lastPageRef;

    struct OperationQueue
    {
      void init() { firstElement = lastElement = RNIL;}
      bool isEmpty() const { return firstElement == RNIL; }
      Uint32 firstElement;
      Uint32 lastElement;
    };

    /**
     * operations queued waiting on REDO to prepare
     */
    struct OperationQueue m_log_prepare_queue;

    /**
     * operations queued waiting on REDO to commit/abort
     */
    struct OperationQueue m_log_complete_queue;

    /**
     *       This variable contains the newest operation in this log
     *       part which have not been committed yet.
     */
    UintR lastLogTcrec;
    /**
     *       This variable indicates which was the last mbyte that was
     *       written before the system crashed.  Discovered during
     *       system restart.
     */
    UintR lastLogfile;
    /**
     *       This variable is used to keep track of the state during
     *       the third phase of the system restart, i.e. when
     *       LogPartRecord::logPartState == 
     *       LogPartRecord::SR_THIRD_PHASE_STARTED.
     */
    LogExecState logExecState;
    /**
     *       This variable contains the lap number of this log part.
     */
    UintR logLap;
    /**
     *       This variable contains the place to stop executing the log
     *       in this phase.
     */
    UintR logLastGci;
    /**
     *       This variable contains the place to start executing the
     *       log in this phase.
     */
    UintR logStartGci;
    /**
     *       The latest GCI completed in this log part.
     */
    UintR logPartNewestCompletedGCI;
    /**
     *       The current state of this log part.                               
     */
    LogPartState logPartState;

    /**
     * does current log-part have tail-problem (i.e 410)
     */
    enum {
      P_TAIL_PROBLEM        = 0x1,// 410
      P_REDO_IO_PROBLEM     = 0x2,// 1234
      P_FILE_CHANGE_PROBLEM = 0x4 // 1220
    };
    Uint32 m_log_problems;

    /**
     *       A timer that is set every time a log page is sent to disk.
     *       Ensures that log pages are not kept in main memory for
     *       more than a certain time.
     */
    UintR logPartTimer;
    /**
     *       The current timer which is set by the periodic signal
     *       received by LQH
     */
    UintR logTimer;
    /** 
     *       Contains the number of the log tail file and the mbyte
     *       reference within that file.  This information ensures that
     *       the tail is not overwritten when writing new log records.
     */
    UintR logTailFileNo;
    /**
     *       The TcConnectionrec used during execution of this log part.
     */
    UintR logTcConrec;
    /**
     *       The number of pages that currently resides in the main
     *       memory buffer.  It does not refer pages that are currently
     *       read from the log files.  Only to pages already read
     *       from the log file.
     */
    UintR mmBufferSize;
    /**
     *       Contains the current number of log files in this log part. 
     */
    UintR noLogFiles;
    /**
     *       This variable is used only during execution of a log
     *       record.  It keeps track of in which page record a log
     *       record was started.  It is used then to deduce which
     *       pages that are dirty after that the log records on the
     *       page have been executed.
     *
     *       It is also used to find out where to write the invalidate
     *       command when that is needed.
     */
    UintR prevLogpage;
    union {
      /**
       *       The number of files remaining to gather GCI information
       *       for during system restart.  Only used if number of files
       *       is larger than 60.
       */
      UintR srRemainingFiles;

      /**
       *       The index of the file which we should start loading redo
       *       meta information from after the 'FRONTPAGE' file has been
       *       closed.
       */
      UintR srLastFileIndex;
    };
    /**
     *       The log file where to start executing the log during
     *       system restart.
     */
    UintR startLogfile;
    /**
     *       The last log file in which to execute the log during system 
     *       restart.                    
     */
    UintR stopLogfile;
    /**
     *       This variable keeps track of when we want to write a complete 
     *       gci log record but have been blocked by an ongoing log operation.
     */
    WaitWriteGciLog waitWriteGciLog;
    /**
     *       The currently executing prepare record starts in this index 
     *       in the log page.            
     */
    Uint16 execSrLogPageIndex;
    /**
     *       Which of the four exec_sr's in the fragment is currently executing
     */
    Uint16 execSrExecuteIndex;
    /**
     *       The number of pages executed in the current mbyte. 
     */
    Uint16 execSrPagesExecuted;
    /**
     *       The number of pages read from disk that have arrived and are 
     *       currently awaiting execution of the log.
     */
    Uint16 execSrPagesRead;
    /**
     *       The number of pages read from disk and currently not arrived 
     *       to the block.             
     */
    Uint16 execSrPagesReading;
    /**
     *       This variable refers to the new header file where we will 
     *       start writing the log after a system restart have been completed.
     */
    Uint16 headFileNo;
    /**
     *       This variable refers to the page number within the header file.
     */
    Uint16 headPageNo;
    /**
     *       This variable refers to the index within the new header
     *       page.
     */
    Uint16 headPageIndex;
    /**
     *       This variables indicates which was the last mbyte in the last 
     *       logfile before a system crash. Discovered during system restart.
     */
    Uint16 lastMbyte;
    /**
     *       This variable is used only during execution of a log
     *       record. It keeps track of in which file page a log
     *       record was started.  It is used if it is needed to write a
     *       dirty page to disk during log execution (this happens when
     *       commit records are invalidated).
     */
    Uint16 prevFilepage;
    /**
     *       This is used to save where we were in the execution of log
     *       records when we find a commit record that needs to be
     *       executed.
     *
     *       This variable is also used to remember the index where the
     *       log type was in the log record. It is only used in this
     *       role when finding a commit record that needs to be
     *       invalidated.
     */
    Uint16 savePageIndex;
    Uint16 logTailMbyte;
    /**
     *       The mbyte within the starting log file where to start 
     *       executing the log.                
     */
    Uint16 startMbyte;
    /**
     *       The last mbyte in which to execute the log during system
     *       restart.
     */
    Uint16 stopMbyte;
   /**
     *       This variable refers to the file where invalidation is
     *       occuring during system/node restart.
     */
    Uint16 invalidateFileNo;
    /**
     *       This variable refers to the page where invalidation is
     *       occuring during system/node restart.
     */
    Uint16 invalidatePageNo;
    /**
     *       For MT LQH the log part (0-3).
     */
    Uint16 logPartNo;

    /**
     * Keep track of the first invalid log page found in our search. This
     * enables us to print information about irregular writes of log pages
     * at the end of the REDO log.
     */
    Uint16 endInvalidMByteSearch;
    Uint16 firstInvalidateFileNo;
    Uint16 firstInvalidatePageNo;
    bool firstInvalidatePageFound;
    /**
     * IO tracker...
     */
    struct IOTracker m_io_tracker;
  }; // Size 164 Bytes
  typedef Ptr<LogPartRecord> LogPartRecordPtr;
  
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$                      LOG FILE RECORD                     $$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /*       THIS RECORD IS ALIGNED TO BE 288 (256 + 32) BYTES.                 */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**
   *              This record contains information about a log file.          
   *              A log file contains log records from several tables and     
   *              fragments of a table. LQH can contain more than             
   *              one log file to ensure faster log processing.               
   *                                                                          
   *              The number of pages to write to disk at a time is           
   *              configurable.                                               
   */
  struct LogFileRecord {
    LogFileRecord() {}

    enum FileChangeState {
      NOT_ONGOING = 0,
      BOTH_WRITES_ONGOING = 1,
      LAST_WRITE_ONGOING = 2,
      FIRST_WRITE_ONGOING = 3,
      WRITE_PAGE_ZERO_ONGOING = 4
    };  
    enum LogFileStatus {
      LFS_IDLE = 0,                     ///< Log file record not in use
      CLOSED = 1,                       ///< Log file closed
      OPENING_INIT = 2,
      OPEN_SR_FRONTPAGE = 3,            ///< Log file opened as part of system
                                        ///< restart.  Open file 0 to find  
                                        ///< the front page of the log part.
      OPEN_SR_LAST_FILE = 4,            ///< Open last log file that was written
                                        ///< before the system restart.  
      OPEN_SR_NEXT_FILE = 5,            ///< Open a log file which is 16 files 
                                        ///< backwards to find the next    
                                        ///< information about GCPs.
      OPEN_EXEC_SR_START = 6,           ///< Log file opened as part of 
                                        ///< executing 
                                        ///< log during system restart. 
      OPEN_EXEC_SR_NEW_MBYTE = 7,
      OPEN_SR_FOURTH_PHASE = 8,
      OPEN_SR_FOURTH_NEXT = 9,
      OPEN_SR_FOURTH_ZERO = 10,
      OPENING_WRITE_LOG = 11,           ///< Log file opened as part of writing 
                                        ///< log during normal operation. 
      OPEN_EXEC_LOG = 12,
      CLOSING_INIT = 13,
      CLOSING_SR = 14,                  ///< Log file closed as part of system 
                                        ///< restart.  Currently trying to  
                                        ///< find where to start executing the 
                                        ///< log
      CLOSING_EXEC_SR = 15,             ///< Log file closed as part of 
                                        ///< executing log during system restart
      CLOSING_EXEC_SR_COMPLETED = 16,
      CLOSING_WRITE_LOG = 17,           ///< Log file closed as part of writing 
                                        ///< log during normal operation. 
      CLOSING_EXEC_LOG = 18,
      OPEN_INIT = 19,
      OPEN = 20,                         ///< Log file open
      OPEN_SR_READ_INVALIDATE_PAGES = 21,
      CLOSE_SR_READ_INVALIDATE_PAGES = 22,
      OPEN_SR_WRITE_INVALIDATE_PAGES = 23,
      CLOSE_SR_WRITE_INVALIDATE_PAGES = 24,
      OPEN_SR_READ_INVALIDATE_SEARCH_FILES = 25,
      CLOSE_SR_READ_INVALIDATE_SEARCH_FILES = 26,
      CLOSE_SR_READ_INVALIDATE_SEARCH_LAST_FILE = 27
#ifndef NO_REDO_OPEN_FILE_CACHE
      ,OPEN_EXEC_LOG_CACHED = 28
      ,CLOSING_EXEC_LOG_CACHED = 29
#endif
      ,CLOSING_SR_FRONTPAGE = 30
    };
    
    /**
     *       When a new mbyte is started in the log we have to find out
     *       how far back in the log we still have prepared operations
     *       which have been neither committed or aborted.  This variable
     *       keeps track of this value for each of the mbytes in this
     *       log file.  This is used in writing down these values in the
     *       header of each log file.  That information is used during
     *       system restart to find the tail of the log.  
     */
    UintR *logLastPrepRef;
    /**
     *       The max global checkpoint completed before the mbyte in the
     *       log file was started.  One variable per mbyte.  
     */
    UintR *logMaxGciCompleted;
    /**
     *       The max global checkpoint started before the mbyte in the log
     *       file was started.  One variable per mbyte.
     */
    UintR *logMaxGciStarted;
    /**
     *       This variable contains the file name as needed by the file 
     *       system when opening the file.
     */
    UintR fileName[4];
    /**
     *       This variable has a reference to the log page which is 
     *       currently in use by the log.     
     */
    UintR currentLogpage;
    /**
     *       The number of the current mbyte in the log file.
     */
    UintR currentMbyte;
    /**
     *       This variable is used when changing files.  It is to find
     *       out when both the last write in the previous file and the
     *       first write in this file has been completed.  After these
     *       writes have completed the variable keeps track of when the
     *       write to page zero in file zero is completed.  
     */
    FileChangeState fileChangeState;
    /**
     *       The number of the file within this log part.
     */
    UintR fileNo;
    /**
     *       This variable shows where to read/write the next pages into
     *       the log.  Used when writing the log during normal operation
     *       and when reading the log during system restart.  It
     *       specifies the page position where each page is 8 kbyte.
     */
    UintR filePosition;
    /**
     *       This contains the file pointer needed by the file system
     *       when reading/writing/closing and synching.  
     */
    UintR fileRef;
    /**
     *       The head of the pages waiting for shipment to disk. 
     *       They are filled with log info. 
     */
    UintR firstFilledPage;
    /**
     *       A list of active read/write operations on the log file.
     *       Operations are always put in last and the first should
     *       always complete first.  
     */
    UintR firstLfo;
    UintR lastLfo;
    /**
     *       The tail of the pages waiting for shipment to disk. 
     *       They are filled with log info.
     */
    UintR lastFilledPage;
    /**
     *       This variable keeps track of the last written page in the
     *       file while writing page zero in file zero when changing log
     *       file.  
     */
    UintR lastPageWritten;
    /**
     *       This variable keeps track of the last written word in the
     *       last page written in the file while writing page zero in
     *       file zero when changing log file.  
     */
    UintR lastWordWritten;
    /**
     *       This variable contains the last word written in the last page.
     */
    LogFileStatus logFileStatus;
    /**
     *       A reference to page zero in this file. 
     *       This page is written before the file is closed.  
     */
    UintR logPageZero;
    /**
     *       This variable contains a reference to the record describing 
     *       this log part.   One of four records (0,1,2 or 3).
     */
    UintR logPartRec;
    /**
     *       Next free log file record or next log file in this log.
     */
    UintR nextLogFile;
    /**
     *       The previous log file.
     */
    UintR prevLogFile;
    /**
     *       The number of remaining words in this mbyte of the log file.
     */
    UintR remainingWordsInMbyte;
    /**
     *       The current file page within the current log file. This is
     *       a reference within the file and not a reference to a log
     *       page record.  It is used to deduce where log records are
     *       written.  Particularly completed gcp records and prepare log
     *       records.  
     */
    Uint16 currentFilepage;
    /**
     *       The number of pages in the list referenced by 
     *       LOG_PAGE_BUFFER.
     */
    Uint16 noLogpagesInBuffer;

#ifndef NO_REDO_OPEN_FILE_CACHE
    Uint32 nextList;
    Uint32 prevList;
#endif
  }; // Size 288 bytes
  typedef Ptr<LogFileRecord> LogFileRecordPtr;
  
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$                      LOG OPERATION RECORD                $$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**
   * This record contains a currently active file operation
   * that has started by the log module.
   */
  struct LogFileOperationRecord {
    enum LfoState {
      IDLE = 0,                         ///< Operation is not used at the moment
      INIT_WRITE_AT_END = 1,            ///< Write in file so that it grows to 
                                        ///< 16 Mbyte
      INIT_FIRST_PAGE = 2,              ///< Initialise the first page in a file
      WRITE_GCI_ZERO = 3,
      WRITE_INIT_MBYTE = 4,
      WRITE_DIRTY = 5,
      READ_SR_FRONTPAGE = 6,            ///< Read page zero in file zero during 
                                        ///< system restart               
      READ_SR_LAST_FILE = 7,            ///< Read page zero in last file open 
                                        ///< before system crash            
      READ_SR_NEXT_FILE = 8,            ///< Read 60 files backwards to find 
                                        ///< further information GCPs in page
                                        ///< zero
      READ_SR_LAST_MBYTE = 9,
      READ_EXEC_SR = 10,
      READ_EXEC_LOG = 11,
      READ_SR_FOURTH_PHASE = 12,
      READ_SR_FOURTH_ZERO = 13,
      FIRST_PAGE_WRITE_IN_LOGFILE = 14,
      LAST_WRITE_IN_FILE = 15,
      WRITE_PAGE_ZERO = 16,
      ACTIVE_WRITE_LOG = 17,             ///< A write operation during 
                                        ///< writing of log
      READ_SR_INVALIDATE_PAGES = 18,
      WRITE_SR_INVALIDATE_PAGES = 19,
      WRITE_SR_INVALIDATE_PAGES_UPDATE_PAGE0 = 20
      ,READ_SR_INVALIDATE_SEARCH_FILES = 21
    };
    /**
     * We have to remember the log pages read. 
     * Otherwise we cannot build the linked list after the pages have 
     * arrived to main memory.  
     */
    UintR logPageArray[16];
    /**
     * A list of the pages that are part of this active operation.
     */
    UintR firstLfoPage;
    /**
     * A timer to ensure that records are not lost.
     */
    UintR lfoTimer;
    /**
     * The word number of the last written word in the last during
     * a file write.  
     */
    UintR lfoWordWritten;
    /**
     * This variable contains the state of the log file operation.     
     */
    LfoState lfoState;
    /**
     * The log file that the file operation affects.
     */
    UintR logFileRec;
    /**
     * The log file operations on a file are kept in a linked list.
     */
    UintR nextLfo;
    /**
     * The page number of the first read/written page during a file 
     * read/write.                
     */
    Uint16 lfoPageNo;
    /**
     * The number of pages written or read during an operation to
     * the log file.                
     */
    Uint16 noPagesRw;
  }; // 92 bytes
  typedef Ptr<LogFileOperationRecord> LogFileOperationRecordPtr;
  
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /* $$$$$$$                      LOG PAGE RECORD                     $$$$$$$ */
  /* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ */
  /**
   *    These are the 8 k pages used to store log records before storing
   *    them in the file system. 
   *    Since 64 kbyte is sent to disk at a time it is necessary to have   
   *    at least 4*64 kbytes of log pages. 
   *    To handle multiple outstanding requests we need some additional pages. 
   *    Thus we allocate 1 mbyte to ensure that we do not get problems with 
   *    insufficient number of pages.
   */
  struct LogPageRecord {
    /**
     * This variable contains the pages that are sent to disk. 
     *
     * All pages contain a header of 12 words:
     * - WORD 0:  CHECKSUM             Calculated before storing on disk and 
     *                                 checked when read from disk.
     * - WORD 1:  LAP                  How many wraparounds have the log 
     *                                 experienced since initial start of the
     *                                 system.
     * - WORD 2:  MAX_GCI_COMPLETED    Which is the maximum gci which have 
     *                                 completed before this page. This 
     *                                 gci will not be found in this    
     *                                 page and hereafter in the log.
     * - WORD 3:  MAX_GCI_STARTED      The maximum gci which have started 
     *                                 before this page.    
     * - WORD 4:  NEXT_PAGE            Pointer to the next page. 
     *                                 Only used in main memory      
     * - WORD 5:  PREVIOUS_PAGE        Pointer to the previous page. 
     *                                 Currently not used.       
     * - WORD 6:  VERSION              NDB version that wrote the page.
     * - WORD 7:  NO_LOG_FILES         Number of log files in this log part.
     * - WORD 8:  CURRENT PAGE INDEX   This keeps track of where we are in the 
     *                                 page.   
     *                                 This is only used when pages is in 
     *                                 memory.
     * - WORD 9:  OLD PREPARE FILE NO  This keeps track of the oldest prepare 
     *                                 operation still alive (not committed 
     *                                 or aborted) when this mbyte started.
     * - WORD 10: OLD PREPARE PAGE REF File page reference within this file 
     *                                 number.    
     *                                 Page no + Page index.
     *                                 If no prepare was alive then these 
     *                                 values points this mbyte.
     * - WORD 11: DIRTY FLAG            = 0 means not dirty and 
     *                                  = 1 means the page is dirty.    
     *                                 Is used when executing log when 
     *                                 a need to write invalid commit 
     *                                 records arise.
     *
     * The remaining 2036 words are used for log information, i.e.
     * log records.
     *
     * A log record on this page has the following layout:
     * - WORD 0: LOG RECORD TYPE                           
     *     The following types are supported:
     *     - PREPARE OPERATION       An operation not yet committed.
     *     - NEW PREPARE OPERATION   A prepared operation already 
     *                               logged is inserted 
     *                               into the log again so that the
     *                               log tail can be advanced. 
     *                               This can happen when a transaction is 
     *                               committed for a long time.     
     *     - ABORT TRANSACTION       A previously prepared transaction 
     *                               was aborted.  
     *     - COMMIT TRANSACTION      A previously prepared transaction 
     *                               was committed.
     *     - INVALID COMMIT          A previous commit record was 
     *                               invalidated by a   
     *                               subsequent system restart.
     *                               A log record must be invalidated
     *                               in a system restart if it belongs
     *                               to a global checkpoint id which
     *                               is not included in the system
     *                               restart.
     *                               Otherwise it will be included in
     *                               a subsequent system restart since
     *                               it will then most likely belong
     *                               to a global checkpoint id which
     *                               is part of that system
     *                               restart.  
     *                               This is not a correct behaviour
     *                               since this operation is lost in a
     *                               system restart and should not
     *                               reappear at a later system
     *                               restart.
     *     - COMPLETED GCI           A GCI has now been completed.
     *     - FRAGMENT SPLIT          A fragment has been split 
     *                               (not implemented yet)
     *     - FILE DESCRIPTOR         This is always the first log record 
     *                               in a file.
     *                               It is always placed on page 0 after 
     *                               the header.
     *                               It is written when the file is 
     *                               opened and when the file is closed.
     *     - NEXT LOG RECORD         This log record only records where 
     *                               the next log record starts.
     *     - NEXT MBYTE RECORD       This log record specifies that there 
     *                               are no more log records in this mbyte.
     *
     *
     * A FILE DESCRIPTOR log record continues as follows:
     * - WORD 1: NO_LOG_DESCRIPTORS  This defines the number of 
     *                               descriptors of log files that
     *                               will follow hereafter (max 32).
     *                               the log descriptor will describe
     *                               information about
     *                               max_gci_completed,
     *                               max_gci_started and log_lap at
     *                               every 1 mbyte of the log file
     *                               since a log file is 16 mbyte
     *                               always, i need 16 entries in the
     *                               array with max_gci_completed,
     *                               max_gci_started and log_lap. thus
     *                               32 entries per log file
     *                               descriptor (max 32*48 = 1536,
     *                               always fits in page 0).
     * - WORD 2: LAST LOG FILE       The number of the log file currently 
     *                               open.  This is only valid in file 0.
     * - WORD 3 - WORD 18:           MAX_GCI_COMPLETED for every 1 mbyte 
     *                               in this log file.
     * - WORD 19 - WORD 34:          MAX_GCI_STARTED for every 1 mbyte 
     *                               in this log file.
     *
     * Then it continues for NO_LOG_DESCRIPTORS until all subsequent 
     * log files (max 32) have been properly described.
     *
     *
     * A PREPARE OPERATION log record continues as follows:
     * - WORD 1: LOG RECORD SIZE
     * - WORD 2: HASH VALUE                   
     * - WORD 3: SCHEMA VERSION 
     * - WORD 4: OPERATION TYPE
     *            = 0 READ,
     *            = 1 UPDATE,
     *            = 2 INSERT,
     *            = 3 DELETE
     * - WORD 5: NUMBER OF WORDS IN ATTRINFO PART
     * - WORD 6: KEY LENGTH IN WORDS
     * - WORD 7 - (WORD 7 + KEY_LENGTH - 1)                 The tuple key
     * - (WORD 7 + KEY_LENGTH) - 
     *   (WORD 7 + KEY_LENGTH + ATTRINFO_LENGTH - 1)        The attrinfo
     *                                                                  
     * A log record can be spread in several pages in some cases.
     * The next log record always starts immediately after this log record.
     * A log record does however never traverse a 1 mbyte boundary. 
     * This is used to ensure that we can always come back if something 
     * strange occurs in the log file.
     * To ensure this we also have log records which only records 
     * the next log record.
     *
     *
     * A COMMIT TRANSACTION log record continues as follows:
     * - WORD 1: TRANSACTION ID PART 1
     * - WORD 2: TRANSACTION ID PART 2
     * - WORD 3: FRAGMENT ID OF THE OPERATION
     * - WORD 4: TABLE ID OF THE OPERATION
     * - WORD 5: THE FILE NUMBER OF THE PREPARE RECORD
     * - WORD 6: THE STARTING PAGE NUMBER OF THE PREPARE RECORD
     * - WORD 7: THE STARTING PAGE INDEX OF THE PREPARE RECORD
     * - WORD 8: THE STOP PAGE NUMBER OF THE PREPARE RECORD
     * - WORD 9: GLOBAL CHECKPOINT OF THE TRANSACTION
     *
     *
     * An ABORT TRANSACTION log record continues as follows:
     * - WORD 1: TRANSACTION ID PART 1
     * - WORD 2: TRANSACTION ID PART 2 
     *
     * 
     * A COMPLETED CGI log record continues as follows:
     * - WORD 1: THE COMPLETED GCI                                 
     *
     *
     * A NEXT LOG RECORD log record continues as follows:
     * - There is no more information needed. 
     *   The next log record will always refer to the start of the next page.
     *
     * A NEXT MBYTE RECORD log record continues as follows:
     * - There is no more information needed. 
     *   The next mbyte will always refer to the start of the next mbyte.
     */
    UintR logPageWord[8192]; // Size 32 kbytes
  };  
  typedef Ptr<LogPageRecord> LogPageRecordPtr;

  struct PageRefRecord {
    UintR pageRef[8];
    UintR prNext;
    UintR prPrev;
    Uint16 prFileNo;
    Uint16 prPageNo;
  }; // size 44 bytes
  typedef Ptr<PageRefRecord> PageRefRecordPtr;

  struct Tablerec {
    enum TableStatus {
      TABLE_DEFINED = 0,
      NOT_DEFINED = 1,
      ADD_TABLE_ONGOING = 2,
      PREP_DROP_TABLE_DONE = 3,
      DROP_TABLE_WAIT_USAGE = 4,
      DROP_TABLE_WAIT_DONE = 5,
      DROP_TABLE_ACC = 6,
      DROP_TABLE_TUP = 7,
      DROP_TABLE_TUX = 8
      ,TABLE_READ_ONLY = 9
    };
    
    UintR fragrec[MAX_FRAG_PER_LQH];
    Uint16 fragid[MAX_FRAG_PER_LQH];
    /**
     * Status of the table 
     */
    TableStatus tableStatus;
    /**
     * Table type and target table of index.
     */
    Uint16 tableType;
    Uint16 primaryTableId;
    Uint32 schemaVersion;
    Uint8 m_disk_table;

    Uint32 usageCountR; // readers
    Uint32 usageCountW; // writers
  }; // Size 100 bytes
  typedef Ptr<Tablerec> TablerecPtr;
#endif // DBLQH_STATE_EXTRACT
  struct TcConnectionrec {
    enum ListState {
      NOT_IN_LIST = 0,
      WAIT_QUEUE_LIST = 3
    };
    enum LogWriteState {
      NOT_STARTED = 0,
      NOT_WRITTEN = 1,
      NOT_WRITTEN_WAIT = 2,
      WRITTEN = 3
    };
    enum AbortState {
      ABORT_IDLE = 0,
      ABORT_ACTIVE = 1,
      NEW_FROM_TC = 2,
      REQ_FROM_TC = 3,
      ABORT_FROM_TC = 4,
      ABORT_FROM_LQH = 5
    };
    enum TransactionState {
      IDLE = 0,

      /* -------------------------------------------------------------------- */
      // Transaction in progress states
      /* -------------------------------------------------------------------- */
      WAIT_ACC = 1,
      WAIT_TUPKEYINFO = 2,
      WAIT_ATTR = 3,
      WAIT_TUP = 4,
      STOPPED = 5,
      LOG_QUEUED = 6,
      PREPARED = 7,
      LOG_COMMIT_WRITTEN_WAIT_SIGNAL = 8,
      LOG_COMMIT_QUEUED_WAIT_SIGNAL = 9,
      
      /* -------------------------------------------------------------------- */
      // Commit in progress states
      /* -------------------------------------------------------------------- */
      COMMIT_STOPPED = 10,
      LOG_COMMIT_QUEUED = 11,
      COMMIT_QUEUED = 12,
      COMMITTED = 13,
      WAIT_TUP_COMMIT= 35,
      
      /* -------------------------------------------------------------------- */
      // Abort in progress states
      /* -------------------------------------------------------------------- */
      WAIT_ACC_ABORT = 14,
      ABORT_QUEUED = 15,
      ABORT_STOPPED = 16,
      WAIT_AI_AFTER_ABORT = 17,
      LOG_ABORT_QUEUED = 18,
      WAIT_TUP_TO_ABORT = 19,
      
      /* -------------------------------------------------------------------- */
      // Scan in progress states
      /* -------------------------------------------------------------------- */
      WAIT_SCAN_AI = 20,
      SCAN_STATE_USED = 21,
      SCAN_FIRST_STOPPED = 22,
      SCAN_CHECK_STOPPED = 23,
      SCAN_STOPPED = 24,
      SCAN_RELEASE_STOPPED = 25,
      SCAN_CLOSE_STOPPED = 26,
      COPY_CLOSE_STOPPED = 27,
      COPY_FIRST_STOPPED = 28,
      COPY_STOPPED = 29,
      SCAN_TUPKEY = 30,
      COPY_TUPKEY = 31,

      TC_NOT_CONNECTED = 32,
      PREPARED_RECEIVED_COMMIT = 33, // Temporary state in write commit log
      LOG_COMMIT_WRITTEN = 34        // Temporary state in write commit log
    };
    enum ConnectState {
      DISCONNECTED = 0,
      CONNECTED = 1,
      COPY_CONNECTED = 2,
      LOG_CONNECTED = 3
    };
#ifndef DBLQH_STATE_EXTRACT
    ConnectState connectState;
    UintR copyCountWords;
    Uint32 keyInfoIVal;
    Uint32 attrInfoIVal;
    UintR transid[2];
    AbortState abortState;
    UintR accConnectrec;
    UintR applOprec;
    UintR clientConnectrec;
    UintR tcTimer;
    UintR currReclenAi;
    UintR currTupAiLen;
    UintR fragmentid;
    UintR fragmentptr;
    UintR gci_hi;
    UintR gci_lo;
    UintR hashValue;
    /**
     * Each operation (TcConnectrec) can be stored in max one out of many 
     * lists.
     * This variable keeps track of which list it is in.
     */
    ListState listState;
    
    UintR logStartFileNo;
    LogWriteState logWriteState;
    UintR nextHashRec;
    UintR nextLogTcrec;
    UintR nextTcLogQueue;
    UintR nextTc;
    UintR nextTcConnectrec;
    UintR prevHashRec;
    UintR prevLogTcrec;
    UintR prevTcLogQueue;
    UintR prevTc;
    UintR readlenAi;
    UintR reqRef;
    UintR reqinfo;
    UintR schemaVersion;
    UintR storedProcId;
    UintR simpleTcConnect;
    UintR tableref;
    UintR tcOprec;
    UintR hashIndex;
    Uint32 tcHashKeyHi;
    UintR tcScanInfo;
    UintR tcScanRec;
    UintR totReclenAi;
    UintR totSendlenAi;
    UintR tupConnectrec;
    UintR savePointId;
    TransactionState transactionState;
    BlockReference applRef;
    BlockReference clientBlockref;

    BlockReference reqBlockref;
    BlockReference tcBlockref;
    BlockReference tcAccBlockref;
    BlockReference tcTuxBlockref;
    BlockReference tcTupBlockref;
    Uint32 commitAckMarker;
    union {
      Uint32 m_scan_curr_range_no;
      UintR noFiredTriggers;
    };
    Uint32 m_corrFactorLo; // For result correlation for linked operations.
    Uint32 m_corrFactorHi;
    Uint64 lqhKeyReqId;
    Uint16 errorCode;
    Uint16 logStartPageIndex;
    Uint16 logStartPageNo;
    Uint16 logStopPageNo;
    Uint16 nextReplica;
    Uint16 primKeyLen;
    Uint16 save1;
    Uint16 nodeAfterNext[3];

    Uint8 activeCreat;
    Uint8 dirtyOp;
    Uint8 indTakeOver;
    Uint8 lastReplicaNo;
    Uint8 lockType;
    Uint8 nextSeqNoReplica;
    Uint8 opSimple;
    Uint8 opExec;
    Uint8 operation;
    Uint8 m_reorg;
    Uint8 reclenAiLqhkey;
    Uint8 replicaType;
    Uint8 seqNoReplica;
    Uint8 tcNodeFailrec;
    Uint8 m_disk_table;
    Uint8 m_use_rowid;
    Uint8 m_dealloc;
    Uint8 m_fire_trig_pass;
    enum op_flags {
      OP_ISLONGREQ              = 0x1,
      OP_SAVEATTRINFO           = 0x2,
      OP_SCANKEYINFOPOSSAVED    = 0x4,
      OP_DEFERRED_CONSTRAINTS   = 0x8,
      OP_NORMAL_PROTOCOL        = 0x10,
      OP_DISABLE_FK             = 0x20
    };
    Uint32 m_flags;
    Uint32 m_log_part_ptr_i;
    SectionReader::PosInfo scanKeyInfoPos;
    Local_key m_row_id;

    struct {
      Uint32 m_cnt;
      Uint32 m_page_id[2];
      Local_key m_disk_ref[2];
    } m_nr_delete;
#endif // DBLQH_STATE_EXTRACT
  }; /* p2c: size = 280 bytes */

#ifndef DBLQH_STATE_EXTRACT
  typedef Ptr<TcConnectionrec> TcConnectionrecPtr;

  struct TcNodeFailRecord {
    enum TcFailStatus {
      TC_STATE_TRUE = 0,
      TC_STATE_FALSE = 1,
      TC_STATE_BREAK = 2
    };
    UintR lastNewTcRef;
    UintR newTcRef;
    TcFailStatus tcFailStatus;
    UintR tcRecNow;
    BlockReference lastNewTcBlockref;
    BlockReference newTcBlockref;
    Uint32 lastTakeOverInstanceId;
    Uint32 takeOverInstanceId;
    Uint32 maxInstanceId;
    Uint16 oldNodeId;
  };
  typedef Ptr<TcNodeFailRecord> TcNodeFailRecordPtr;

  struct CommitLogRecord {
    Uint32 startPageNo;
    Uint32 startPageIndex;
    Uint32 stopPageNo;
    Uint32 fileNo;
  };
  //for statistic information about redo log initialization
  Uint32 totalLogFiles;
  Uint32 logFileInitDone;
  Uint32 totallogMBytes;
  Uint32 logMBytesInitDone;

  Uint32 m_startup_report_frequency;
  NDB_TICKS m_last_report_time;
 
public:
  Dblqh(Block_context& ctx, Uint32 instanceNumber = 0);
  virtual ~Dblqh();

  void receive_keyinfo(Signal*, Uint32 * data, Uint32 len);
  void receive_attrinfo(Signal*, Uint32 * data, Uint32 len);
 
  Uint32 get_scan_api_op_ptr(Uint32 scan_ptr_i);
private:
  BLOCK_DEFINES(Dblqh);

  void execPACKED_SIGNAL(Signal* signal);
  void execDEBUG_SIG(Signal* signal);
  void execATTRINFO(Signal* signal);
  void execKEYINFO(Signal* signal);
  void execLQHKEYREQ(Signal* signal);
  void execLQHKEYREF(Signal* signal);
  void execCOMMIT(Signal* signal);
  void execCOMPLETE(Signal* signal);
  void execLQHKEYCONF(Signal* signal);
  void execTESTSIG(Signal* signal);
  void execLQH_RESTART_OP(Signal* signal);
  void execCONTINUEB(Signal* signal);
  void execSTART_RECREQ(Signal* signal);
  void execSTART_RECCONF(Signal* signal);
  void execEXEC_FRAGREQ(Signal* signal);
  void execEXEC_FRAGCONF(Signal* signal);
  void execEXEC_FRAGREF(Signal* signal);
  void execSTART_EXEC_SR(Signal* signal);
  void execEXEC_SRREQ(Signal* signal);
  void execEXEC_SRCONF(Signal* signal);
  void execREAD_PSEUDO_REQ(Signal* signal);
  void execSIGNAL_DROPPED_REP(Signal* signal);

  void execDBINFO_SCANREQ(Signal* signal); 
  void execDUMP_STATE_ORD(Signal* signal);
  void execACC_ABORTCONF(Signal* signal);
  void execNODE_FAILREP(Signal* signal);
  void execCHECK_LCP_STOP(Signal* signal);
  void execSEND_PACKED(Signal* signal);
  void execTUP_ATTRINFO(Signal* signal);
  void execREAD_CONFIG_REQ(Signal* signal);

  void execCREATE_TAB_REQ(Signal* signal);
  void execCREATE_TAB_REF(Signal* signal);
  void execCREATE_TAB_CONF(Signal* signal);
  void execLQHADDATTREQ(Signal* signal);
  void execTUP_ADD_ATTCONF(Signal* signal);
  void execTUP_ADD_ATTRREF(Signal* signal);

  void execLQHFRAGREQ(Signal* signal);
  void execACCFRAGCONF(Signal* signal);
  void execACCFRAGREF(Signal* signal);
  void execTUPFRAGCONF(Signal* signal);
  void execTUPFRAGREF(Signal* signal);

  void execDROP_FRAG_REQ(Signal*);
  void execDROP_FRAG_REF(Signal*);
  void execDROP_FRAG_CONF(Signal*);

  void execTAB_COMMITREQ(Signal* signal);
  void execACCSEIZECONF(Signal* signal);
  void execACCSEIZEREF(Signal* signal);
  void execREAD_NODESCONF(Signal* signal);
  void execREAD_NODESREF(Signal* signal);
  void execSTTOR(Signal* signal);
  void execNDB_STTOR(Signal* signal);
  void execTUPSEIZECONF(Signal* signal);
  void execTUPSEIZEREF(Signal* signal);
  void execACCKEYCONF(Signal* signal);
  void execACCKEYREF(Signal* signal);
  void execTUPKEYCONF(Signal* signal);
  void execTUPKEYREF(Signal* signal);
  void execABORT(Signal* signal);
  void execABORTREQ(Signal* signal);
  void execCOMMITREQ(Signal* signal);
  void execCOMPLETEREQ(Signal* signal);
  void execMEMCHECKREQ(Signal* signal);
  void execSCAN_FRAGREQ(Signal* signal);
  void execSCAN_NEXTREQ(Signal* signal);
  void execACC_SCANCONF(Signal* signal);
  void execACC_SCANREF(Signal* signal);
  void execNEXT_SCANCONF(Signal* signal);
  void execNEXT_SCANREF(Signal* signal);
  void execACC_TO_REF(Signal* signal);
  void execSTORED_PROCCONF(Signal* signal);
  void execSTORED_PROCREF(Signal* signal);
  void execCOPY_FRAGREQ(Signal* signal);
  void execCOPY_FRAGREF(Signal* signal);
  void execCOPY_FRAGCONF(Signal* signal);
  void execPREPARE_COPY_FRAG_REQ(Signal* signal);
  void execUPDATE_FRAG_DIST_KEY_ORD(Signal*);
  void execCOPY_ACTIVEREQ(Signal* signal);
  void execCOPY_STATEREQ(Signal* signal);
  void execLQH_TRANSREQ(Signal* signal);
  void execTRANSID_AI(Signal* signal);
  void execINCL_NODEREQ(Signal* signal);

  void force_lcp(Signal* signal);
  void execLCP_FRAG_ORD(Signal* signal);
  void execEMPTY_LCP_REQ(Signal* signal);
  
  void execSTART_FRAGREQ(Signal* signal);
  void execSTART_RECREF(Signal* signal);

  void execGCP_SAVEREQ(Signal* signal);
  void execSUB_GCP_COMPLETE_REP(Signal* signal);
  void execFSOPENREF(Signal* signal);
  void execFSOPENCONF(Signal* signal);
  void execFSCLOSECONF(Signal* signal);
  void execFSWRITECONF(Signal* signal);
  void execFSWRITEREF(Signal* signal);
  void execFSREADCONF(Signal* signal);
  void execFSREADREF(Signal* signal);
  void execFSWRITEREQ(Signal*);
  void execTIME_SIGNAL(Signal* signal);
  void execFSSYNCCONF(Signal* signal);

  void execALTER_TAB_REQ(Signal* signal);
  void execALTER_TAB_CONF(Signal* signal);

  void execCREATE_TRIG_IMPL_CONF(Signal* signal);
  void execCREATE_TRIG_IMPL_REF(Signal* signal);
  void execCREATE_TRIG_IMPL_REQ(Signal* signal);

  void execDROP_TRIG_IMPL_CONF(Signal* signal);
  void execDROP_TRIG_IMPL_REF(Signal* signal);
  void execDROP_TRIG_IMPL_REQ(Signal* signal);

  void execPREP_DROP_TAB_REQ(Signal* signal);
  void execDROP_TAB_REQ(Signal* signal);
  void execDROP_TAB_REF(Signal*);
  void execDROP_TAB_CONF(Signal*);
  void dropTable_nextStep(Signal*, AddFragRecordPtr);

  void execLQH_ALLOCREQ(Signal* signal);
  void execTUP_DEALLOCREQ(Signal* signal);
  void execLQH_WRITELOG_REQ(Signal* signal);

  void execTUXFRAGCONF(Signal* signal);
  void execTUXFRAGREF(Signal* signal);
  void execTUX_ADD_ATTRCONF(Signal* signal);
  void execTUX_ADD_ATTRREF(Signal* signal);

  void execBUILD_INDX_IMPL_REF(Signal* signal);
  void execBUILD_INDX_IMPL_CONF(Signal* signal);

  void execFIRE_TRIG_REQ(Signal*);

  // Statement blocks

  void timer_handling(Signal *signal);
  void init_acc_ptr_list(ScanRecord*);
  bool seize_acc_ptr_list(ScanRecord*, Uint32, Uint32);
  void release_acc_ptr_list(ScanRecord*);
  Uint32 get_acc_ptr_from_scan_record(ScanRecord*, Uint32, bool);
  void set_acc_ptr_in_scan_record(ScanRecord*, Uint32, Uint32);
  void i_get_acc_ptr(ScanRecord*, Uint32*&, Uint32);
  
  void removeTable(Uint32 tableId);
  void sendLCP_COMPLETE_REP(Signal* signal, Uint32 lcpId);
  void sendEMPTY_LCP_CONF(Signal* signal, bool idle);
  void sendLCP_FRAGIDREQ(Signal* signal);
  void sendLCP_FRAG_REP(Signal * signal, const LcpRecord::FragOrd &,
                        const Fragrecord*) const;

  void updatePackedList(Signal* signal, HostRecord * ahostptr, Uint16 hostId);
  void LQHKEY_abort(Signal* signal, int errortype);
  void LQHKEY_error(Signal* signal, int errortype);
  void nextRecordCopy(Signal* signal);
  Uint32 calculateHash(Uint32 tableId, const Uint32* src);
  void continueAfterCheckLcpStopBlocked(Signal* signal);
  void checkLcpStopBlockedLab(Signal* signal);
  void sendCommittedTc(Signal* signal, BlockReference atcBlockref);
  void sendCompletedTc(Signal* signal, BlockReference atcBlockref);
  void sendLqhkeyconfTc(Signal* signal, BlockReference atcBlockref);
  void sendCommitLqh(Signal* signal, BlockReference alqhBlockref);
  void sendCompleteLqh(Signal* signal, BlockReference alqhBlockref);
  void sendPackedSignal(Signal* signal,
                        struct PackedWordsContainer * container);
  void cleanUp(Signal* signal);
  void sendAttrinfoLoop(Signal* signal);
  void sendAttrinfoSignal(Signal* signal);
  void sendLqhAttrinfoSignal(Signal* signal);
  void sendKeyinfoAcc(Signal* signal, Uint32 pos);
  Uint32 initScanrec(const class ScanFragReq *,
                     Uint32 aiLen);
  void initScanTc(const class ScanFragReq *,
                  Uint32 transid1,
                  Uint32 transid2,
                  Uint32 fragId,
                  Uint32 nodeId,
                  Uint32 hashHi);
  void finishScanrec(Signal* signal);
  void releaseScanrec(Signal* signal);
  void seizeScanrec(Signal* signal);
  Uint32 sendKeyinfo20(Signal* signal, ScanRecord *, TcConnectionrec *);
  void sendTCKEYREF(Signal*, Uint32 dst, Uint32 route, Uint32 cnt);
  void sendScanFragConf(Signal* signal, Uint32 scanCompleted);
  void initCopyrec(Signal* signal);
  void initCopyTc(Signal* signal, Operation_t);
  void sendCopyActiveConf(Signal* signal,Uint32 tableId);
  void checkLcpCompleted(Signal* signal);
  void checkLcpHoldop(Signal* signal);
  bool checkLcpStarted(Signal* signal);
  void checkLcpTupprep(Signal* signal);
  void getNextFragForLcp(Signal* signal);
  void sendAccContOp(Signal* signal);
  void sendStartLcp(Signal* signal);
  void setLogTail(Signal* signal, Uint32 keepGci);
  Uint32 remainingLogSize(const LogFileRecordPtr &sltCurrLogFilePtr,
			  const LogPartRecordPtr &sltLogPartPtr);
  bool checkGcpCompleted(Signal* signal, Uint32 pageWritten, Uint32 wordWritten);
  void initFsopenconf(Signal* signal);
  void initFsrwconf(Signal* signal, bool write);
  void initLfo(Signal* signal);
  void initLogfile(Signal* signal, Uint32 fileNo);
  void initLogpage(Signal* signal);
  void openFileRw(Signal* signal, LogFileRecordPtr olfLogFilePtr, bool writeBuffer = true);
  void openLogfileInit(Signal* signal);
  void openNextLogfile(Signal* signal);
  void releaseLfo(Signal* signal);
  void releaseLfoPages(Signal* signal);
  void releaseLogpage(Signal* signal);
  void seizeLfo(Signal* signal);
  void seizeLogfile(Signal* signal);
  void seizeLogpage(Signal* signal);
  void writeFileDescriptor(Signal* signal);
  void writeFileHeaderOpen(Signal* signal, Uint32 type);
  void writeInitMbyte(Signal* signal);
  void writeSinglePage(Signal* signal, Uint32 pageNo,
                       Uint32 wordWritten, Uint32 place,
                       bool sync = true);
  void buildLinkedLogPageList(Signal* signal);
  void changeMbyte(Signal* signal);
  Uint32 checkIfExecLog(Signal* signal);
  void checkNewMbyte(Signal* signal);
  void checkReadExecSr(Signal* signal);
  void checkScanTcCompleted(Signal* signal);
  void closeFile(Signal* signal, LogFileRecordPtr logFilePtr, Uint32 place);
  void completedLogPage(Signal* signal,
                        Uint32 clpType,
                        Uint32 place,
                        bool sync_flag = false);

  void commit_reorg(TablerecPtr tablePtr);
  void wait_reorg_suma_filter_enabled(Signal*);

  void deleteFragrec(Uint32 fragId);
  void deleteTransidHash(Signal* signal);
  void findLogfile(Signal* signal,
                   Uint32 fileNo,
                   LogPartRecordPtr flfLogPartPtr,
                   LogFileRecordPtr* parLogFilePtr);
  void findPageRef(Signal* signal, CommitLogRecord* commitLogRecord);
  int  findTransaction(UintR Transid1, UintR Transid2, UintR TcOprec, UintR hi);
  void getFirstInLogQueue(Signal* signal, Ptr<TcConnectionrec>&dst);
  void remove_from_prepare_log_queue(Signal *signal, TcConnectionrecPtr tcPtr);
  bool getFragmentrec(Signal* signal, Uint32 fragId);
  void initialiseAddfragrec(Signal* signal);
  void initialiseFragrec(Signal* signal);
  void initialiseGcprec(Signal* signal);
  void initialiseLcpRec(Signal* signal);
  void initialiseLfo(Signal* signal);
  void initialiseLogFile(Signal* signal);
  void initialiseLogPage(Signal* signal);
  void initialiseLogPart(Signal* signal);
  void initialisePageRef(Signal* signal);
  void initialiseScanrec(Signal* signal);
  void initialiseTabrec(Signal* signal);
  void initialiseTcrec(Signal* signal);
  void initialiseTcNodeFailRec(Signal* signal);
  void initFragrec(Signal* signal,
                   Uint32 tableId,
                   Uint32 fragId,
                   Uint32 copyType);
  void initFragrecSr(Signal* signal);
  void initGciInLogFileRec(Signal* signal, Uint32 noFdDesc);
  void initLcpSr(Signal* signal,
                 Uint32 lcpNo,
                 Uint32 lcpId,
                 Uint32 tableId,
                 Uint32 fragId,
                 Uint32 fragPtr);
  void initLogpart(Signal* signal);
  void initLogPointers(Signal* signal);
  void initReqinfoExecSr(Signal* signal);
  bool insertFragrec(Signal* signal, Uint32 fragId);
  void linkFragQueue(Signal* signal);
  void linkWaitLog(Signal*, LogPartRecordPtr, LogPartRecord::OperationQueue &);
  void logNextStart(Signal* signal);
  void moveToPageRef(Signal* signal);
  void readAttrinfo(Signal* signal);
  void readCommitLog(Signal* signal, CommitLogRecord* commitLogRecord);
  void readExecLog(Signal* signal);
  void readExecSrNewMbyte(Signal* signal);
  void readExecSr(Signal* signal);
  void readKey(Signal* signal);
  void readLogData(Signal* signal, Uint32 noOfWords, Uint32& sectionIVal);
  void readLogHeader(Signal* signal);
  Uint32 readLogword(Signal* signal);
  Uint32 readLogwordExec(Signal* signal);
  void readSinglePage(Signal* signal, Uint32 pageNo);
  void releaseActiveCopy(Signal* signal);
  void releaseAddfragrec(Signal* signal);
  void releaseFragrec();
  void releaseOprec(Signal* signal);
  void releasePageRef(Signal* signal);
  void releaseMmPages(Signal* signal);
  void releasePrPages(Signal* signal);
  void releaseTcrec(Signal* signal, TcConnectionrecPtr tcConnectptr);
  void releaseTcrecLog(Signal* signal, TcConnectionrecPtr tcConnectptr);
  void releaseWaitQueue(Signal* signal);
  void removeLogTcrec(Signal* signal);
  void removePageRef(Signal* signal);
  Uint32 returnExecLog(Signal* signal);
  int saveAttrInfoInSection(const Uint32* dataPtr, Uint32 len);
  void seizeAddfragrec(Signal* signal);
  Uint32 seizeSingleSegment();
  Uint32 copyNextRange(Uint32 * dst, TcConnectionrec*);

  void seizeFragmentrec(Signal* signal);
  void seizePageRef(Signal* signal);
  void seizeTcrec();
  void sendAborted(Signal* signal);
  void sendLqhTransconf(Signal* signal, LqhTransConf::OperationStatus);
  void sendTupkey(Signal* signal);
  void startExecSr(Signal* signal);
  void startNextExecSr(Signal* signal);
  void startTimeSupervision(Signal* signal);
  void stepAhead(Signal* signal, Uint32 stepAheadWords);
  void systemError(Signal* signal, int line);
  void writeAbortLog(Signal* signal);
  void writeCommitLog(Signal* signal, LogPartRecordPtr regLogPartPtr);
  void writeCompletedGciLog(Signal* signal);
  void writeDbgInfoPageHeader(LogPageRecordPtr logPagePtr, Uint32 place,
                              Uint32 pageNo, Uint32 wordWritten);
  void writeDirty(Signal* signal, Uint32 place);
  void writeKey(Signal* signal);
  void writeLogHeader(Signal* signal);
  void writeLogWord(Signal* signal, Uint32 data);
  void writeLogWords(Signal* signal, const Uint32* data, Uint32 len);
  void writeNextLog(Signal* signal);
  void errorReport(Signal* signal, int place);
  void warningReport(Signal* signal, int place);
  void invalidateLogAfterLastGCI(Signal *signal);
  Uint32 nextLogFilePtr(Uint32 logFilePtrI);
  void readFileInInvalidate(Signal *signal, int stepNext);
  void writeFileInInvalidate(Signal *signal, int stepPrev);
  bool invalidateCloseFile(Signal*, Ptr<LogPartRecord>, Ptr<LogFileRecord>,
                           LogFileRecord::LogFileStatus status);
  void exitFromInvalidate(Signal* signal);
  Uint32 calcPageCheckSum(LogPageRecordPtr logP);
  Uint32 handleLongTupKey(Signal* signal, Uint32* dataPtr, Uint32 len);

  void rebuildOrderedIndexes(Signal* signal, Uint32 tableId);

  // Generated statement blocks
  void systemErrorLab(Signal* signal, int line);
  void initFourth(Signal* signal);
  void packLqhkeyreqLab(Signal* signal);
  void sendNdbSttorryLab(Signal* signal);
  void execSrCompletedLab(Signal* signal);
  void execLogRecord(Signal* signal);
  void srPhase3Comp(Signal* signal);
  void srLogLimits(Signal* signal);
  void srGciLimits(Signal* signal);
  void srPhase3Start(Signal* signal);
  void checkStartCompletedLab(Signal* signal);
  void continueAbortLab(Signal* signal);
  void abortContinueAfterBlockedLab(Signal* signal);
  void abortCommonLab(Signal* signal);
  void localCommitLab(Signal* signal);
  void abortErrorLab(Signal* signal);
  void continueAfterReceivingAllAiLab(Signal* signal);
  void abortStateHandlerLab(Signal* signal);
  void writeAttrinfoLab(Signal* signal);
  void scanAttrinfoLab(Signal* signal, Uint32* dataPtr, Uint32 length);
  void abort_scan(Signal* signal, Uint32 scan_ptr_i, Uint32 errcode);
  void localAbortStateHandlerLab(Signal* signal);
  void logLqhkeyreqLab(Signal* signal);
  void logLqhkeyreqLab_problems(Signal* signal);
  void update_log_problem(Signal*, LogPartRecordPtr, Uint32 problem, bool);
  void lqhAttrinfoLab(Signal* signal, Uint32* dataPtr, Uint32 length);
  void rwConcludedAiLab(Signal* signal);
  void aiStateErrorCheckLab(Signal* signal, Uint32* dataPtr, Uint32 length);
  void takeOverErrorLab(Signal* signal);
  void endgettupkeyLab(Signal* signal);
  bool checkTransporterOverloaded(Signal* signal,
                                  const NodeBitmask& all,
                                  const class LqhKeyReq* req);
  void earlyKeyReqAbort(Signal* signal, 
                        const class LqhKeyReq * lqhKeyReq, 
                        bool isLongReq,
                        Uint32 errorCode);
  void logLqhkeyrefLab(Signal* signal);
  void closeCopyLab(Signal* signal);
  void commitReplyLab(Signal* signal);
  void completeUnusualLab(Signal* signal);
  void completeTransNotLastLab(Signal* signal);
  void completedLab(Signal* signal);
  void copyCompletedLab(Signal* signal);
  void completeLcpRoundLab(Signal* signal, Uint32 lcpId);
  void continueAfterLogAbortWriteLab(Signal* signal);
  void sendAttrinfoLab(Signal* signal);
  void sendExecConf(Signal* signal);
  void execSr(Signal* signal);
  void srFourthComp(Signal* signal);
  void timeSup(Signal* signal);
  void closeCopyRequestLab(Signal* signal);
  void closeScanRequestLab(Signal* signal);
  void scanTcConnectLab(Signal* signal, Uint32 startTcCon, Uint32 fragId);
  void initGcpRecLab(Signal* signal);
  void prepareContinueAfterBlockedLab(Signal* signal);
  void commitContinueAfterBlockedLab(Signal* signal);
  void continueCopyAfterBlockedLab(Signal* signal);
  void continueFirstCopyAfterBlockedLab(Signal* signal);
  void continueFirstScanAfterBlockedLab(Signal* signal);
  void continueScanAfterBlockedLab(Signal* signal);
  void continueScanReleaseAfterBlockedLab(Signal* signal);
  void continueCloseScanAfterBlockedLab(Signal* signal);
  void continueCloseCopyAfterBlockedLab(Signal* signal);
  void sendExecFragRefLab(Signal* signal);
  void fragrefLab(Signal* signal, Uint32 errorCode, const LqhFragReq* req);
  void abortAddFragOps(Signal* signal);
  void rwConcludedLab(Signal* signal);
  void sendsttorryLab(Signal* signal);
  void initialiseRecordsLab(Signal* signal, Uint32 data, Uint32, Uint32);
  void startphase2Lab(Signal* signal, Uint32 config);
  void startphase3Lab(Signal* signal);
  void startphase4Lab(Signal* signal);
  void startphase6Lab(Signal* signal);
  void moreconnectionsLab(Signal* signal);
  void scanReleaseLocksLab(Signal* signal);
  void closeScanLab(Signal* signal);
  void nextScanConfLoopLab(Signal* signal);
  void scanNextLoopLab(Signal* signal);
  void commitReqLab(Signal* signal, Uint32 gci_hi, Uint32 gci_lo);
  void completeTransLastLab(Signal* signal);
  void tupScanCloseConfLab(Signal* signal);
  void tupCopyCloseConfLab(Signal* signal);
  void accScanCloseConfLab(Signal* signal);
  void accCopyCloseConfLab(Signal* signal);
  void nextScanConfScanLab(Signal* signal);
  void nextScanConfCopyLab(Signal* signal);
  void continueScanNextReqLab(Signal* signal);
  bool keyinfoLab(const Uint32 * src, Uint32 len);
  void copySendTupkeyReqLab(Signal* signal);
  void storedProcConfScanLab(Signal* signal);
  void storedProcConfCopyLab(Signal* signal);
  void copyStateFinishedLab(Signal* signal);
  void lcpCompletedLab(Signal* signal);
  void lcpStartedLab(Signal* signal);
  void contChkpNextFragLab(Signal* signal);
  void startLcpRoundLab(Signal* signal);
  void startFragRefLab(Signal* signal);
  void srCompletedLab(Signal* signal);
  void openFileInitLab(Signal* signal);
  void openSrFrontpageLab(Signal* signal);
  void openSrLastFileLab(Signal* signal);
  void openSrNextFileLab(Signal* signal);
  void openExecSrStartLab(Signal* signal);
  void openExecSrNewMbyteLab(Signal* signal);
  void openSrFourthPhaseLab(Signal* signal);
  void openSrFourthZeroSkipInitLab(Signal* signal);
  void openSrFourthZeroLab(Signal* signal);
  void openExecLogLab(Signal* signal);
  void checkInitCompletedLab(Signal* signal);
  void closingSrLab(Signal* signal);
  void closingSrFrontPage(Signal* signal);
  void closeExecSrLab(Signal* signal);
  void execLogComp(Signal* signal);
  void execLogComp_extra_files_closed(Signal* signal);
  void closeWriteLogLab(Signal* signal);
  void closeExecLogLab(Signal* signal);
  void writePageZeroLab(Signal* signal, Uint32 from);
  void lastWriteInFileLab(Signal* signal);
  void initWriteEndLab(Signal* signal);
  void initFirstPageLab(Signal* signal);
  void writeGciZeroLab(Signal* signal);
  void writeDirtyLab(Signal* signal);
  void writeInitMbyteLab(Signal* signal);
  void writeLogfileLab(Signal* signal);
  void firstPageWriteLab(Signal* signal);
  void readSrLastMbyteLab(Signal* signal);
  void readSrLastFileLab(Signal* signal);
  void readSrNextFileLab(Signal* signal);
  void readExecSrLab(Signal* signal);
  void readExecLogLab(Signal* signal);
  void readSrFourthPhaseLab(Signal* signal);
  void readSrFourthZeroLab(Signal* signal);
  void copyLqhKeyRefLab(Signal* signal);
  void restartOperationsLab(Signal* signal);
  void lqhTransNextLab(Signal* signal, TcNodeFailRecordPtr tcNodeFailPtr);
  void restartOperationsAfterStopLab(Signal* signal);
  void startphase1Lab(Signal* signal, Uint32 config, Uint32 nodeId);
  void tupkeyConfLab(Signal* signal);
  void copyTupkeyRefLab(Signal* signal);
  void copyTupkeyConfLab(Signal* signal);
  void scanTupkeyConfLab(Signal* signal);
  void scanTupkeyRefLab(Signal* signal);
  void accScanConfScanLab(Signal* signal);
  void accScanConfCopyLab(Signal* signal);
  void scanLockReleasedLab(Signal* signal);
  void openSrFourthNextLab(Signal* signal);
  void closingInitLab(Signal* signal);
  void closeExecSrCompletedLab(Signal* signal);
  void readSrFrontpageLab(Signal* signal);
  
  void sendCreateTabReq(Signal*, AddFragRecordPtr);
  void sendAddAttrReq(Signal* signal);
  void sendAddFragReq(Signal* signal);
  void dropTab_wait_usage(Signal*);
  Uint32 get_table_state_error(Ptr<Tablerec> tabPtr) const;
  void wait_readonly(Signal*);
  int check_tabstate(Signal * signal, const Tablerec * tablePtrP, Uint32 op);

  void remove_commit_marker(TcConnectionrec * const regTcPtr);
  // Initialisation
  void initData();
  void initRecords();
protected:
  virtual bool getParam(const char* name, Uint32* count);
  
private:
  

  bool validate_filter(Signal*);
  bool match_and_print(Signal*, Ptr<TcConnectionrec>);
  void ndbinfo_write_op(Ndbinfo::Row&, TcConnectionrecPtr tcPtr);

  void define_backup(Signal*);
  void execDEFINE_BACKUP_REF(Signal*);
  void execDEFINE_BACKUP_CONF(Signal*);
  void execBACKUP_FRAGMENT_REF(Signal* signal);
  void execBACKUP_FRAGMENT_CONF(Signal* signal);
  void execLCP_PREPARE_REF(Signal* signal);
  void execLCP_PREPARE_CONF(Signal* signal);
  void execEND_LCPREF(Signal* signal);
  void execEND_LCPCONF(Signal* signal);
  Uint32 m_backup_ptr;

  void send_restore_lcp(Signal * signal);
  void execRESTORE_LCP_REF(Signal* signal);
  void execRESTORE_LCP_CONF(Signal* signal);

  /**
   * For periodic redo log file initialization status reporting 
   * and explicit redo log file status reporting
   */
  /* Init at start of redo log file initialization, timers etc... */
  void initReportStatus(Signal* signal);
  /* Check timers for reporting at certain points */
  void checkReportStatus(Signal* signal);
  /* Send redo log file initialization status, invoked either periodically, or explicitly */
  void reportStatus(Signal* signal);
  /* redo log file initialization completed report*/
  void logfileInitCompleteReport(Signal* signal);
 
  void check_send_scan_hb_rep(Signal* signal, ScanRecord*, TcConnectionrec*);

  void unlockError(Signal* signal, Uint32 error);
  void handleUserUnlockRequest(Signal* signal);
  
  void execLCP_STATUS_CONF(Signal* signal);
  void execLCP_STATUS_REF(Signal* signal);

  void startLcpFragWatchdog(Signal* signal);
  void stopLcpFragWatchdog();
  void invokeLcpFragWatchdogThread(Signal* signal);
  void checkLcpFragWatchdog(Signal* signal);
  
  Dbtup* c_tup;
  Dbacc* c_acc;
  Lgman* c_lgman;

  /**
   * Read primary key from tup
   */
  Uint32 readPrimaryKeys(ScanRecord*, TcConnectionrec*, Uint32 * dst);

  /**
   * Read primary key from operation
   */
public:
  Uint32 readPrimaryKeys(Uint32 opPtrI, Uint32 * dst, bool xfrm);
private:

  void acckeyconf_tupkeyreq(Signal*, TcConnectionrec*, Fragrecord*,
                            Uint32, Uint32, Uint32);
  void acckeyconf_load_diskpage(Signal*,TcConnectionrecPtr,Fragrecord*,
                                Uint32, Uint32);

  void handle_nr_copy(Signal*, Ptr<TcConnectionrec>);
  void exec_acckeyreq(Signal*, Ptr<TcConnectionrec>);
  int compare_key(const TcConnectionrec*, const Uint32 * ptr, Uint32 len);
  void nr_copy_delete_row(Signal*, Ptr<TcConnectionrec>, Local_key*, Uint32);
  Uint32 getKeyInfoWordOrZero(const TcConnectionrec* regTcPtr, 
                              Uint32 offset);
public:
  struct Nr_op_info
  {
    Uint32 m_ptr_i;
    Uint32 m_tup_frag_ptr_i;
    Uint32 m_gci_hi;
    Uint32 m_gci_lo;
    Uint32 m_page_id;
    Local_key m_disk_ref;
  };
  void get_nr_op_info(Nr_op_info*, Uint32 page_id = RNIL);
  void nr_delete_complete(Signal*, Nr_op_info*);
  
public:
  void acckeyconf_load_diskpage_callback(Signal*, Uint32, Uint32);
  
private:
  void next_scanconf_load_diskpage(Signal* signal, 
				   ScanRecordPtr scanPtr,
				   Ptr<TcConnectionrec> regTcPtr,
				   Fragrecord* fragPtrP);
  
  void next_scanconf_tupkeyreq(Signal* signal, ScanRecordPtr,
			       TcConnectionrec * regTcPtr,
			       Fragrecord* fragPtrP,
			       Uint32 disk_page);

public:  
  void next_scanconf_load_diskpage_callback(Signal* signal, Uint32, Uint32);

  void tupcommit_conf_callback(Signal* signal, Uint32 tcPtrI);
private:
  void tupcommit_conf(Signal* signal, TcConnectionrec *,Fragrecord *);
  
// ----------------------------------------------------------------
// These are variables handling the records. For most records one
// pointer to the array of structs, one pointer-struct, a file size
// and a first free record variable. The pointer struct are temporary
// variables that are kept on the class object since there are often a
// great deal of those variables that exist simultaneously and
// thus no perfect solution of handling them is currently available.
// ----------------------------------------------------------------
/* ------------------------------------------------------------------------- */
/*       POSITIONS WITHIN THE ATTRINBUF AND THE MAX SIZE OF DATA WITHIN AN   */
/*       ATTRINBUF.                                                          */
/* ------------------------------------------------------------------------- */


#define ZADDFRAGREC_FILE_SIZE 1
  AddFragRecord *addFragRecord;
  AddFragRecordPtr addfragptr;
  UintR cfirstfreeAddfragrec;
  UintR caddfragrecFileSize;
  Uint32 c_active_add_frag_ptr_i;

// Configurable
  FragrecordPtr fragptr;
  ArrayPool<Fragrecord> c_fragment_pool;
  RSS_AP_SNAPSHOT(c_fragment_pool);

#define ZGCPREC_FILE_SIZE 1
  GcpRecord *gcpRecord;
  GcpRecordPtr gcpPtr;
  UintR cgcprecFileSize;

// MAX_NDB_NODES is the size of this array
  HostRecord *hostRecord;
  UintR chostFileSize;

#define ZNO_CONCURRENT_LCP 1
  LcpRecord *lcpRecord;
  LcpRecordPtr lcpPtr;
  UintR cfirstfreeLcpLoc;
  UintR clcpFileSize;

  LogPartRecord *logPartRecord;
  LogPartRecordPtr logPartPtr;
  UintR clogPartFileSize;
  Uint32 clogFileSize; // In MBYTE
  /* Max entries for log file:mb meta info in file page zero */
  Uint32 cmaxLogFilesInPageZero; 
  /* Max valid entries for log file:mb meta info in file page zero 
   *  = cmaxLogFilesInPageZero - 1
   * as entry zero (for current file) is invalid.
   */
  Uint32 cmaxValidLogFilesInPageZero;

#if defined VM_TRACE || defined ERROR_INSERT
  Uint32 cmaxLogFilesInPageZero_DUMP;
#endif

// Configurable
  LogFileRecord *logFileRecord;
  LogFileRecordPtr logFilePtr;
  UintR cfirstfreeLogFile;
  UintR clogFileFileSize;

#define ZLFO_MIN_FILE_SIZE 256
// RedoBuffer/32K minimum ZLFO_MIN_FILE_SIZE
  LogFileOperationRecord *logFileOperationRecord;
  LogFileOperationRecordPtr lfoPtr;
  UintR cfirstfreeLfo;
  UintR clfoFileSize;

  LogPageRecord *logPageRecord;
  LogPageRecordPtr logPagePtr;
  UintR cfirstfreeLogPage;
  UintR clogPageFileSize;
  Uint32 clogPageCount;

#define ZPAGE_REF_FILE_SIZE 20
  PageRefRecord *pageRefRecord;
  PageRefRecordPtr pageRefPtr;
  UintR cfirstfreePageRef;
  UintR cpageRefFileSize;

// Configurable
  ArrayPool<ScanRecord> c_scanRecordPool;
  ScanRecordPtr scanptr;
  Uint32 cscanrecFileSize;
  DLList<ScanRecord> m_reserved_scans; // LCP + NR

// Configurable
  Tablerec *tablerec;
  TablerecPtr tabptr;
  UintR ctabrecFileSize;

// Configurable
  TcConnectionrec *tcConnectionrec;
  TcConnectionrecPtr tcConnectptr;
  UintR cfirstfreeTcConrec;
  UintR ctcConnectrecFileSize;

// MAX_NDB_NODES is the size of this array
  TcNodeFailRecord *tcNodeFailRecord;
  UintR ctcNodeFailrecFileSize;

  Uint16 terrorCode;

  Uint32 c_firstInNodeGroup;

// ------------------------------------------------------------------------
// These variables are used to store block state which do not need arrays
// of struct's.
// ------------------------------------------------------------------------
  Uint32 c_lcpId;
  Uint32 cnoOfFragsCheckpointed;
  Uint32 c_last_force_lcp_time;
  Uint32 c_free_mb_force_lcp_limit; // Force lcp when less than this free mb
  Uint32 c_free_mb_tail_problem_limit; // Set TAIL_PROBLEM when less than this..

/* ------------------------------------------------------------------------- */
// cmaxWordsAtNodeRec keeps track of how many words that currently are
// outstanding in a node recovery situation.
// cbookedAccOps keeps track of how many operation records that have been
// booked in ACC for the scan processes.
// cmaxAccOps contains the maximum number of operation records which can be
// allocated for scan purposes in ACC.
/* ------------------------------------------------------------------------- */
  UintR cmaxWordsAtNodeRec;
  UintR cbookedAccOps;
  UintR cmaxAccOps;
/* ------------------------------------------------------------------------- */
/*THIS STATE VARIABLE IS ZTRUE IF AN ADD NODE IS ONGOING. ADD NODE MEANS     */
/*THAT CONNECTIONS ARE SET-UP TO THE NEW NODE.                               */
/* ------------------------------------------------------------------------- */
  Uint8 caddNodeState;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE SPECIFIES WHICH TYPE OF RESTART THAT IS ONGOING              */
/* ------------------------------------------------------------------------- */
  Uint16 cstartType;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE INDICATES WHETHER AN INITIAL RESTART IS ONGOING OR NOT.      */
/* ------------------------------------------------------------------------- */
  Uint8 cinitialStartOngoing;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE KEEPS TRACK OF WHEN TUP AND ACC HAVE COMPLETED EXECUTING     */
/*THEIR UNDO LOG.                                                            */
/* ------------------------------------------------------------------------- */
  ExecUndoLogState csrExecUndoLogState;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE KEEPS TRACK OF WHEN TUP AND ACC HAVE CONFIRMED COMPLETION    */
/*OF A LOCAL CHECKPOINT ROUND.                                               */
/* ------------------------------------------------------------------------- */
  LcpCloseState clcpCompletedState;
/* ------------------------------------------------------------------------- */
/*DURING CONNECTION PROCESSES IN SYSTEM RESTART THESE VARIABLES KEEP TRACK   */
/*OF HOW MANY CONNECTIONS AND RELEASES THAT ARE TO BE PERFORMED.             */
/* ------------------------------------------------------------------------- */
/***************************************************************************>*/
/*THESE VARIABLES CONTAIN INFORMATION USED DURING SYSTEM RESTART.            */
/***************************************************************************>*/
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE IS ZTRUE IF THE SIGNAL START_REC_REQ HAVE BEEN RECEIVED.     */
/*RECEPTION OF THIS SIGNAL INDICATES THAT ALL FRAGMENTS THAT THIS NODE       */
/*SHOULD START HAVE BEEN RECEIVED.                                           */
/* ------------------------------------------------------------------------- */
  enum { 
    SRR_INITIAL                = 0
    ,SRR_START_REC_REQ_ARRIVED = 1
    ,SRR_REDO_COMPLETE         = 2
    ,SRR_FIRST_LCP_DONE        = 3
  } cstartRecReq;
  Uint32 cstartRecReqData;
  
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE KEEPS TRACK OF HOW MANY FRAGMENTS THAT PARTICIPATE IN        */
/*EXECUTING THE LOG. IF ZERO WE DON'T NEED TO EXECUTE THE LOG AT ALL.        */
/* ------------------------------------------------------------------------- */
  Uint32 cnoFragmentsExecSr;

  /**
   * This is no of sent GSN_EXEC_FRAGREQ during this log phase
   */
  Uint32 cnoOutstandingExecFragReq;

/* ------------------------------------------------------------------------- */
/*THIS VARIABLE KEEPS TRACK OF WHICH OF THE FIRST TWO RESTART PHASES THAT    */
/*HAVE COMPLETED.                                                            */
/* ------------------------------------------------------------------------- */
  Uint8 csrPhaseStarted;
/* ------------------------------------------------------------------------- */
/*NUMBER OF PHASES COMPLETED OF EXECUTING THE FRAGMENT LOG.                  */
/* ------------------------------------------------------------------------- */
  Uint8 csrPhasesCompleted;
/* ------------------------------------------------------------------------- */
/*THE BLOCK REFERENCE OF THE MASTER DIH DURING SYSTEM RESTART.               */
/* ------------------------------------------------------------------------- */
  BlockReference cmasterDihBlockref;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE IS THE HEAD OF A LINKED LIST OF FRAGMENTS WAITING TO BE      */
/*RESTORED FROM DISK.                                                        */
/* ------------------------------------------------------------------------- */
  DLFifoList<Fragrecord> c_lcp_waiting_fragments;  // StartFragReq'ed
  DLFifoList<Fragrecord> c_lcp_restoring_fragments; // Restoring as we speek
  DLFifoList<Fragrecord> c_lcp_complete_fragments;  // Restored
  
/* ------------------------------------------------------------------------- */
/*USED DURING SYSTEM RESTART, INDICATES THE OLDEST GCI THAT CAN BE RESTARTED */
/*FROM AFTER THIS SYSTEM RESTART. USED TO FIND THE LOG TAIL.                 */
/* ------------------------------------------------------------------------- */
  UintR crestartOldestGci;
/* ------------------------------------------------------------------------- */
/*USED DURING SYSTEM RESTART, INDICATES THE NEWEST GCI THAT CAN BE RESTARTED */
/*AFTER THIS SYSTEM RESTART. USED TO FIND THE LOG HEAD.                      */
/* ------------------------------------------------------------------------- */
  UintR crestartNewestGci;
/* ------------------------------------------------------------------------- */
/*THE NUMBER OF LOG FILES. SET AS A PARAMETER WHEN NDB IS STARTED.           */
/* ------------------------------------------------------------------------- */
  UintR cnoLogFiles;
/* ------------------------------------------------------------------------- */
/*THESE TWO VARIABLES CONTAIN THE NEWEST GCI RECEIVED IN THE BLOCK AND THE   */
/*NEWEST COMPLETED GCI IN THE BLOCK.                                         */
/* ------------------------------------------------------------------------- */
  UintR cnewestGci;
  UintR cnewestCompletedGci;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE ONLY PASSES INFORMATION FROM STTOR TO STTORRY = TEMPORARY    */
/* ------------------------------------------------------------------------- */
  Uint16 csignalKey;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE CONTAINS THE CURRENT START PHASE IN THE BLOCK. IS ZNIL IF    */
/*NO SYSTEM RESTART IS ONGOING.                                              */
/* ------------------------------------------------------------------------- */
  Uint16 cstartPhase;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE CONTAIN THE CURRENT GLOBAL CHECKPOINT RECORD. IT'S RNIL IF   */
/*NOT A GCP SAVE IS ONGOING.                                                 */
/* ------------------------------------------------------------------------- */
  UintR ccurrentGcprec;
/* ------------------------------------------------------------------------- */
/*THESE VARIABLES ARE USED TO KEEP TRACK OF ALL ACTIVE COPY FRAGMENTS IN LQH.*/
/* ------------------------------------------------------------------------- */
  Uint8 cnoActiveCopy;
  UintR cactiveCopy[4];
/* ------------------------------------------------------------------------- */
/* These variable is used to keep track of what time we have reported so far */
/* in the TIME_SIGNAL handling.                                              */
/* ------------------------------------------------------------------------- */
  NDB_TICKS c_latestTIME_SIGNAL;
  Uint64 c_elapsed_time_millis;

/* ------------------------------------------------------------------------- */
/*THESE VARIABLES CONTAIN THE BLOCK REFERENCES OF THE OTHER NDB BLOCKS.      */
/*ALSO THE BLOCK REFERENCE OF MY OWN BLOCK = LQH                             */
/* ------------------------------------------------------------------------- */
  BlockReference caccBlockref;
  BlockReference ctupBlockref;
  BlockReference ctuxBlockref;
  BlockReference cownref;
  Uint32 cTransactionDeadlockDetectionTimeout;
  UintR cLqhTimeOutCount;
  UintR cLqhTimeOutCheckCount;
  UintR cnoOfLogPages;
/* ------------------------------------------------------------------------- */
/*THIS VARIABLE CONTAINS MY OWN PROCESSOR ID.                                */
/* ------------------------------------------------------------------------- */
  NodeId cownNodeid;

/* ------------------------------------------------------------------------- */
/*THESE VARIABLES CONTAIN INFORMATION ABOUT THE OTHER NODES IN THE SYSTEM    */
/*THESE VARIABLES ARE MOSTLY USED AT SYSTEM RESTART AND ADD NODE TO SET-UP   */
/*AND RELEASE CONNECTIONS TO OTHER NODES IN THE CLUSTER.                     */
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
/*THIS ARRAY CONTAINS THE PROCESSOR ID'S OF THE NODES THAT ARE ALIVE.        */
/*CNO_OF_NODES SPECIFIES HOW MANY NODES THAT ARE CURRENTLY ALIVE.            */
/*CNODE_VERSION SPECIFIES THE NDB VERSION EXECUTING ON THE NODE.             */
/* ------------------------------------------------------------------------- */
  UintR cpackedListIndex;
  Uint16 cpackedList[MAX_NDB_NODES];
  UintR cnodeData[MAX_NDB_NODES];
  UintR cnodeStatus[MAX_NDB_NODES];
  UintR cnoOfNodes;

  NdbNodeBitmask m_sr_nodes;
  NdbNodeBitmask m_sr_exec_sr_req;
  NdbNodeBitmask m_sr_exec_sr_conf;

/* ------------------------------------------------------------------------- */
/* THIS VARIABLE CONTAINS THE DIRECTORY OF A HASH TABLE OF ALL ACTIVE        */
/* OPERATION IN THE BLOCK. IT IS USED TO BE ABLE TO QUICKLY ABORT AN         */
/* OPERATION WHERE THE CONNECTION WAS LOST DUE TO NODE FAILURES. IT IS       */
/* ACTUALLY USED FOR ALL ABORTS COMMANDED BY TC.                             */
/* ------------------------------------------------------------------------- */
  UintR preComputedRequestInfoMask;
  UintR ctransidHash[1024];
  
  Uint32 c_diskless;
  Uint32 c_o_direct;
  Uint32 m_use_om_init;
  Uint32 c_error_insert_table_id;

#ifndef NO_REDO_PAGE_CACHE
  /***********************************************************
   * MODULE: Redo Page Cache
   *
   *   When running redo, current codes scan log until finding a commit
   *     record (for an operation). The commit record contains a back-pointer
   *     to a prepare-record.
   *
   *   If the prepare record is inside the 512k window that is being read
   *     from redo-log, the access is quick.
   *
   *   But it's not, then the following sequence is performed
   *     [file-open]?[page-read][execute-log-record][file-close]?[release-page]
   *
   *   For big (or long running) transactions this becomes very inefficient
   *
   *   The RedoPageCache changes this so that the pages that are not released
   *     in sequence above, but rather put into a LRU (using RedoBuffer)
   */

  /**
   * This is a "dummy" struct that is used when
   *  putting LogPageRecord-entries into lists/hashes
   */
  struct RedoCacheLogPageRecord
  {
    RedoCacheLogPageRecord() {}
    /**
     * NOTE: These numbers must match page-header definition
     */
    Uint32 header0[15];
    Uint32 m_page_no;
    Uint32 m_file_no;
    Uint32 header1[5];
    Uint32 m_part_no;
    Uint32 nextList;
    Uint32 nextHash;
    Uint32 prevList;
    Uint32 prevHash;
    Uint32 rest[8192-27];

    inline bool equal(const RedoCacheLogPageRecord & p) const {
      return
        (p.m_part_no == m_part_no) &&
        (p.m_page_no == m_page_no) &&
        (p.m_file_no == m_file_no);
    }

    inline Uint32 hashValue() const {
      return (m_part_no << 24) + (m_file_no << 16) + m_page_no;
    }
  };
  struct RedoPageCache
  {
    RedoPageCache() : m_hash(m_pool), m_lru(m_pool),
                      m_hits(0),m_multi_page(0), m_multi_miss(0) {}
    DLHashTable<RedoCacheLogPageRecord> m_hash;
    DLCFifoList<RedoCacheLogPageRecord> m_lru;
    ArrayPool<RedoCacheLogPageRecord> m_pool;
    Uint32 m_hits;
    Uint32 m_multi_page;
    Uint32 m_multi_miss;
  } m_redo_page_cache;

  void evict(RedoPageCache&, Uint32 cnt);
  void do_evict(RedoPageCache&, Ptr<RedoCacheLogPageRecord>);
  void addCachePages(RedoPageCache&,
                     Uint32 partNo,
                     Uint32 startPageNo,
                     LogFileOperationRecord*);
  void release(RedoPageCache&);
#endif

#ifndef NO_REDO_OPEN_FILE_CACHE
  struct RedoOpenFileCache
  {
    RedoOpenFileCache() : m_lru(m_pool), m_hits(0), m_close_cnt(0) {}

    DLCFifoList<LogFileRecord> m_lru;
    ArrayPool<LogFileRecord> m_pool;
    Uint32 m_hits;
    Uint32 m_close_cnt;
  } m_redo_open_file_cache;

  void openFileRw_cache(Signal* signal, LogFileRecordPtr olfLogFilePtr);
  void closeFile_cache(Signal* signal, LogFileRecordPtr logFilePtr, Uint32);
  void release(Signal*, RedoOpenFileCache&);
#endif

public:
  bool is_same_trans(Uint32 opId, Uint32 trid1, Uint32 trid2);
  void get_op_info(Uint32 opId, Uint32 *hash, Uint32* gci_hi, Uint32* gci_lo,
                   Uint32* transId1, Uint32* transId2);
  void accminupdate(Signal*, Uint32 opPtrI, const Local_key*);
  void accremoverow(Signal*, Uint32 opPtrI, const Local_key*);

  /**
   *
   */
  struct CommitAckMarker {
    CommitAckMarker() {}
    Uint32 transid1;
    Uint32 transid2;
    
    Uint32 apiRef;    // Api block ref
    Uint32 apiOprec;  // Connection Object in NDB API
    BlockReference tcRef;
    union { Uint32 nextPool; Uint32 nextHash; };
    Uint32 prevHash;
    Uint32 reference_count;
    bool in_hash;

    inline bool equal(const CommitAckMarker & p) const {
      return ((p.transid1 == transid1) && (p.transid2 == transid2));
    }
    
    inline Uint32 hashValue() const {
      return transid1;
    }
  };

  typedef Ptr<CommitAckMarker> CommitAckMarkerPtr;
  ArrayPool<CommitAckMarker>   m_commitAckMarkerPool;
  DLHashTable<CommitAckMarker> m_commitAckMarkerHash;
  typedef DLHashTable<CommitAckMarker>::Iterator CommitAckMarkerIterator;
  void execREMOVE_MARKER_ORD(Signal* signal);
  void scanMarkers(Signal* signal, Uint32 tcNodeFail, Uint32 bucket, Uint32 i);
  bool check_tc_and_update_max_instance(BlockReference ref,
                                        TcNodeFailRecord *tcNodeFailPtr);

  void ndbdFailBlockCleanupCallback(Signal* signal, Uint32 failedNodeID, Uint32 ignoredRc);

  struct MonotonicCounters {
    MonotonicCounters() :
      operations(0) {}

    Uint64 operations;

    Uint32 build_event_rep(Signal* signal) const
    {
      /*
        Read saved value from CONTINUEB, subtract from
        counter and write to EVENT_REP
      */
      struct { const Uint64* ptr; Uint64 old; } vars[] = {
        { &operations, 0 }
      };
      const size_t num = sizeof(vars)/sizeof(vars[0]);

      signal->theData[0] = NDB_LE_OperationReportCounters;

      // Read old values from signal
      for (size_t i = 0; i < num ; i++)
      {
        vars[i].old =
          (signal->theData[1+(2*i)+1] |(Uint64(signal->theData[1+(2*i)])<< 32));
      }

      // Write difference back to signal
      for (size_t i = 0; i < num ; i++)
      {
        signal->theData[1 + i] = (Uint32)(*vars[i].ptr - vars[i].old);
      }
      return 1 + num;
    }

    Uint32 build_continueB(Signal* signal) const
    {
      /* Save current value of counters to CONTINUEB */
      const Uint64* vars[] = { &operations };
      const size_t num = sizeof(vars)/sizeof(vars[0]);

      for (size_t i = 0; i < num ; i++)
      {
        signal->theData[1+i*2] = Uint32(*vars[i] >> 32);
        signal->theData[1+i*2+1] = Uint32(*vars[i]);
      }
      return 1 + num * 2;
    }

  } c_Counters;

  Uint32 c_max_redo_lag;
  Uint32 c_max_redo_lag_counter;
  Uint64 cTotalLqhKeyReqCount;
  Uint32 c_max_parallel_scans_per_frag;

  Uint64 c_keyOverloads;
  
  /* All that apply */
  Uint64 c_keyOverloadsTcNode;
  Uint64 c_keyOverloadsReaderApi;
  Uint64 c_keyOverloadsPeerNode;
  Uint64 c_keyOverloadsSubscriber;
  
  Uint64 c_scanSlowDowns; 
    


  inline bool getAllowRead() const {
    return getNodeState().startLevel < NodeState::SL_STOPPING_3;
  }

  DLHashTable<ScanRecord> c_scanTakeOverHash;

  inline bool TRACE_OP_CHECK(const TcConnectionrec* regTcPtr);
#ifdef ERROR_INSERT
  void TRACE_OP_DUMP(const TcConnectionrec* regTcPtr, const char * pos);
#endif

#ifdef ERROR_INSERT
  Uint32 c_master_node_id;
#endif

  Uint32 get_node_status(Uint32 nodeId) const;
  bool check_ndb_versions() const;

  void suspendFile(Signal* signal, Uint32 filePtrI, Uint32 millis);
  void suspendFile(Signal* signal, Ptr<LogFileRecord> logFile, Uint32 millis);

  void send_runredo_event(Signal*, LogPartRecord *, Uint32 currgci);

  void sendFireTrigConfTc(Signal* signal, BlockReference ref, Uint32 Tdata[]);
  bool check_fire_trig_pass(Uint32 op, Uint32 pass);
#endif
};
#ifndef DBLQH_STATE_EXTRACT
inline
bool
Dblqh::ScanRecord::check_scan_batch_completed() const
{
  Uint32 max_rows = m_max_batch_size_rows;
  Uint32 max_bytes = m_max_batch_size_bytes;

  return m_stop_batch ||
    (max_rows > 0 && (m_curr_batch_size_rows >= max_rows))  ||
    (max_bytes > 0 && (m_curr_batch_size_bytes >= max_bytes));
}

inline
void
Dblqh::i_get_acc_ptr(ScanRecord* scanP, Uint32* &acc_ptr, Uint32 index)
{
  /* Return ptr to place where acc ptr for operation with given
   * index is stored.
   * If index == 0, it's stored in the ScanRecord, otherwise it's 
   * stored in a segment linked from the ScanRecord.
   */
  if (index == 0) {
    acc_ptr= (Uint32*)&scanP->scan_acc_op_ptr[0];
  } else {
    jam();
    
    Uint32 segmentIVal, segment, segmentOffset;
    SegmentedSectionPtr segPtr;

    segment= (index + SectionSegment::DataLength -1) / 
      SectionSegment::DataLength;
    segmentOffset= (index - 1) % SectionSegment::DataLength;

    ndbassert( segment < ScanRecord::MaxScanAccSegments );

    segmentIVal= scanP->scan_acc_op_ptr[ segment ];
    getSection(segPtr, segmentIVal);

    acc_ptr= &segPtr.p->theData[ segmentOffset ];
  }
}

inline
bool
Dblqh::is_same_trans(Uint32 opId, Uint32 trid1, Uint32 trid2)
{
  TcConnectionrecPtr regTcPtr;  
  regTcPtr.i= opId;
  ptrCheckGuard(regTcPtr, ctcConnectrecFileSize, tcConnectionrec);
  return ((regTcPtr.p->transid[0] == trid1) &&
          (regTcPtr.p->transid[1] == trid2));
}

inline
void
Dblqh::get_op_info(Uint32 opId, Uint32 *hash, Uint32* gci_hi, Uint32* gci_lo,
                   Uint32* transId1, Uint32* transId2)
{
  TcConnectionrecPtr regTcPtr;  
  regTcPtr.i= opId;
  ptrCheckGuard(regTcPtr, ctcConnectrecFileSize, tcConnectionrec);
  *hash = regTcPtr.p->hashValue;
  *gci_hi = regTcPtr.p->gci_hi;
  *gci_lo = regTcPtr.p->gci_lo;
  *transId1 = regTcPtr.p->transid[0];
  *transId2 = regTcPtr.p->transid[1];
}

inline
void
Dblqh::accminupdate(Signal* signal, Uint32 opId, const Local_key* key)
{
  TcConnectionrecPtr regTcPtr;  
  regTcPtr.i= opId;
  ptrCheckGuard(regTcPtr, ctcConnectrecFileSize, tcConnectionrec);
  signal->theData[0] = regTcPtr.p->accConnectrec;
  signal->theData[1] = key->m_page_no;
  signal->theData[2] = key->m_page_idx;
  c_acc->execACCMINUPDATE(signal);

  if (ERROR_INSERTED(5714))
  {
    FragrecordPtr regFragptr;
    regFragptr.i = regTcPtr.p->fragmentptr;
    c_fragment_pool.getPtr(regFragptr);
    if (regFragptr.p->m_copy_started_state == Fragrecord::AC_NR_COPY)
      ndbout << " LK: " << *key;
  }

  if (ERROR_INSERTED(5712) || ERROR_INSERTED(5713))
    ndbout << " LK: " << *key;
  regTcPtr.p->m_row_id = *key;
}

inline
void
Dblqh::accremoverow(Signal* signal, Uint32 opId, const Local_key* key)
{
  TcConnectionrecPtr regTcPtr;
  regTcPtr.i= opId;
  ptrCheckGuard(regTcPtr, ctcConnectrecFileSize, tcConnectionrec);
  c_acc->removerow(regTcPtr.p->accConnectrec, key);
}

inline
bool
Dblqh::TRACE_OP_CHECK(const TcConnectionrec* regTcPtr)
{
  if (ERROR_INSERTED(5714))
  {
    FragrecordPtr regFragptr;
    regFragptr.i = regTcPtr->fragmentptr;
    c_fragment_pool.getPtr(regFragptr);
    return regFragptr.p->m_copy_started_state == Fragrecord::AC_NR_COPY;
  }

  return (ERROR_INSERTED(5712) && 
	  (regTcPtr->operation == ZINSERT ||
	   regTcPtr->operation == ZDELETE)) ||
    ERROR_INSERTED(5713);
}
#endif

#undef JAM_FILE_ID

#endif
