xlogrecovery.h File Reference

#include "access/xlogreader.h"
#include "catalog/pg_control.h"
#include "lib/stringinfo.h"
#include "utils/timestamp.h"

Include dependency graph for xlogrecovery.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Data Structures
struct	EndOfWalRecoveryInfo

Typedefs
typedef enum RecoveryPauseState	RecoveryPauseState

Enumerations
enum	RecoveryTargetType {   RECOVERY_TARGET_UNSET , RECOVERY_TARGET_XID , RECOVERY_TARGET_TIME , RECOVERY_TARGET_NAME ,   RECOVERY_TARGET_LSN , RECOVERY_TARGET_IMMEDIATE }
enum	RecoveryTargetTimeLineGoal { RECOVERY_TARGET_TIMELINE_CONTROLFILE , RECOVERY_TARGET_TIMELINE_LATEST , RECOVERY_TARGET_TIMELINE_NUMERIC }
enum	RecoveryPauseState { RECOVERY_NOT_PAUSED , RECOVERY_PAUSE_REQUESTED , RECOVERY_PAUSED }

Functions
Size	XLogRecoveryShmemSize (void)
void	XLogRecoveryShmemInit (void)
void	InitWalRecovery (ControlFileData *ControlFile, bool *wasShutdown_ptr, bool *haveBackupLabel_ptr, bool *haveTblspcMap_ptr)
void	PerformWalRecovery (void)
EndOfWalRecoveryInfo *	FinishWalRecovery (void)
void	ShutdownWalRecovery (void)
void	RemovePromoteSignalFiles (void)
bool	HotStandbyActive (void)
XLogRecPtr	GetXLogReplayRecPtr (TimeLineID *replayTLI)
RecoveryPauseState	GetRecoveryPauseState (void)
void	SetRecoveryPause (bool recoveryPause)
void	GetXLogReceiptTime (TimestampTz *rtime, bool *fromStream)
TimestampTz	GetLatestXTime (void)
TimestampTz	GetCurrentChunkReplayStartTime (void)
XLogRecPtr	GetCurrentReplayRecPtr (TimeLineID *replayEndTLI)
bool	PromoteIsTriggered (void)
bool	CheckPromoteSignal (void)
void	WakeupRecovery (void)
void	StartupRequestWalReceiverRestart (void)
void	XLogRequestWalReceiverReply (void)
void	RecoveryRequiresIntParameter (const char *param_name, int currValue, int minValue)
void	xlog_outdesc (StringInfo buf, XLogReaderState *record)

Variables
PGDLLIMPORT bool	recoveryTargetInclusive
PGDLLIMPORT int	recoveryTargetAction
PGDLLIMPORT int	recovery_min_apply_delay
PGDLLIMPORT char *	PrimaryConnInfo
PGDLLIMPORT char *	PrimarySlotName
PGDLLIMPORT char *	recoveryRestoreCommand
PGDLLIMPORT char *	recoveryEndCommand
PGDLLIMPORT char *	archiveCleanupCommand
PGDLLIMPORT TransactionId	recoveryTargetXid
PGDLLIMPORT char *	recovery_target_time_string
PGDLLIMPORT TimestampTz	recoveryTargetTime
PGDLLIMPORT const char *	recoveryTargetName
PGDLLIMPORT XLogRecPtr	recoveryTargetLSN
PGDLLIMPORT RecoveryTargetType	recoveryTarget
PGDLLIMPORT bool	wal_receiver_create_temp_slot
PGDLLIMPORT RecoveryTargetTimeLineGoal	recoveryTargetTimeLineGoal
PGDLLIMPORT TimeLineID	recoveryTargetTLIRequested
PGDLLIMPORT TimeLineID	recoveryTargetTLI
PGDLLIMPORT bool	reachedConsistency
PGDLLIMPORT bool	StandbyMode

Typedef Documentation

RecoveryPauseState

typedef enum RecoveryPauseState RecoveryPauseState

Enumeration Type Documentation

RecoveryPauseState

enum RecoveryPauseState

Enumerator
RECOVERY_NOT_PAUSED
RECOVERY_PAUSE_REQUESTED
RECOVERY_PAUSED

Definition at line 44 of file xlogrecovery.h.

{
    RECOVERY_NOT_PAUSED,        /* pause not requested */
    RECOVERY_PAUSE_REQUESTED,   /* pause requested, but not yet paused */
    RECOVERY_PAUSED,            /* recovery is paused */
} RecoveryPauseState;

RecoveryTargetTimeLineGoal

enum RecoveryTargetTimeLineGoal

Enumerator
RECOVERY_TARGET_TIMELINE_CONTROLFILE
RECOVERY_TARGET_TIMELINE_LATEST
RECOVERY_TARGET_TIMELINE_NUMERIC

Definition at line 36 of file xlogrecovery.h.

{
    RECOVERY_TARGET_TIMELINE_CONTROLFILE,
    RECOVERY_TARGET_TIMELINE_LATEST,
    RECOVERY_TARGET_TIMELINE_NUMERIC,
} RecoveryTargetTimeLineGoal;

RecoveryTargetType

enum RecoveryTargetType

Enumerator
RECOVERY_TARGET_UNSET
RECOVERY_TARGET_XID
RECOVERY_TARGET_TIME
RECOVERY_TARGET_NAME
RECOVERY_TARGET_LSN
RECOVERY_TARGET_IMMEDIATE

Definition at line 23 of file xlogrecovery.h.

{
    RECOVERY_TARGET_UNSET,
    RECOVERY_TARGET_XID,
    RECOVERY_TARGET_TIME,
    RECOVERY_TARGET_NAME,
    RECOVERY_TARGET_LSN,
    RECOVERY_TARGET_IMMEDIATE,
} RecoveryTargetType;

Function Documentation

CheckPromoteSignal()

bool CheckPromoteSignal

(

void

)

Definition at line 4407 of file xlogrecovery.c.

{
    struct stat stat_buf;
 
    if (stat(PROMOTE_SIGNAL_FILE, &stat_buf) == 0)
        return true;
 
    return false;
}

References PROMOTE_SIGNAL_FILE, and stat.

Referenced by CheckForStandbyTrigger(), and process_pm_pmsignal().

FinishWalRecovery()

EndOfWalRecoveryInfo* FinishWalRecovery

(

void

)

Definition at line 1423 of file xlogrecovery.c.

{
    EndOfWalRecoveryInfo *result = palloc(sizeof(EndOfWalRecoveryInfo));
    XLogRecPtr  lastRec;
    TimeLineID  lastRecTLI;
    XLogRecPtr  endOfLog;
 
    /*
     * Kill WAL receiver, if it's still running, before we continue to write
     * the startup checkpoint and aborted-contrecord records. It will trump
     * over these records and subsequent ones if it's still alive when we
     * start writing WAL.
     */
    XLogShutdownWalRcv();
 
    /*
     * We are now done reading the xlog from stream. Turn off streaming
     * recovery to force fetching the files (which would be required at end of
     * recovery, e.g., timeline history file) from archive or pg_wal.
     *
     * Note that standby mode must be turned off after killing WAL receiver,
     * i.e., calling XLogShutdownWalRcv().
     */
    Assert(!WalRcvStreaming());
    StandbyMode = false;
 
    /*
     * Determine where to start writing WAL next.
     *
     * Re-fetch the last valid or last applied record, so we can identify the
     * exact endpoint of what we consider the valid portion of WAL.  There may
     * be an incomplete continuation record after that, in which case
     * 'abortedRecPtr' and 'missingContrecPtr' are set and the caller will
     * write a special OVERWRITE_CONTRECORD message to mark that the rest of
     * it is intentionally missing.  See CreateOverwriteContrecordRecord().
     *
     * An important side-effect of this is to load the last page into
     * xlogreader. The caller uses it to initialize the WAL for writing.
     */
    if (!InRecovery)
    {
        lastRec = CheckPointLoc;
        lastRecTLI = CheckPointTLI;
    }
    else
    {
        lastRec = XLogRecoveryCtl->lastReplayedReadRecPtr;
        lastRecTLI = XLogRecoveryCtl->lastReplayedTLI;
    }
    XLogPrefetcherBeginRead(xlogprefetcher, lastRec);
    (void) ReadRecord(xlogprefetcher, PANIC, false, lastRecTLI);
    endOfLog = xlogreader->EndRecPtr;
 
    /*
     * Remember the TLI in the filename of the XLOG segment containing the
     * end-of-log.  It could be different from the timeline that endOfLog
     * nominally belongs to, if there was a timeline switch in that segment,
     * and we were reading the old WAL from a segment belonging to a higher
     * timeline.
     */
    result->endOfLogTLI = xlogreader->seg.ws_tli;
 
    if (ArchiveRecoveryRequested)
    {
        /*
         * We are no longer in archive recovery state.
         *
         * We are now done reading the old WAL.  Turn off archive fetching if
         * it was active.
         */
        Assert(InArchiveRecovery);
        InArchiveRecovery = false;
 
        /*
         * If the ending log segment is still open, close it (to avoid
         * problems on Windows with trying to rename or delete an open file).
         */
        if (readFile >= 0)
        {
            close(readFile);
            readFile = -1;
        }
    }
 
    /*
     * Copy the last partial block to the caller, for initializing the WAL
     * buffer for appending new WAL.
     */
    if (endOfLog % XLOG_BLCKSZ != 0)
    {
        char       *page;
        int         len;
        XLogRecPtr  pageBeginPtr;
 
        pageBeginPtr = endOfLog - (endOfLog % XLOG_BLCKSZ);
        Assert(readOff == XLogSegmentOffset(pageBeginPtr, wal_segment_size));
 
        /* Copy the valid part of the last block */
        len = endOfLog % XLOG_BLCKSZ;
        page = palloc(len);
        memcpy(page, xlogreader->readBuf, len);
 
        result->lastPageBeginPtr = pageBeginPtr;
        result->lastPage = page;
    }
    else
    {
        /* There is no partial block to copy. */
        result->lastPageBeginPtr = endOfLog;
        result->lastPage = NULL;
    }
 
    /*
     * Create a comment for the history file to explain why and where timeline
     * changed.
     */
    result->recoveryStopReason = getRecoveryStopReason();
 
    result->lastRec = lastRec;
    result->lastRecTLI = lastRecTLI;
    result->endOfLog = endOfLog;
 
    result->abortedRecPtr = abortedRecPtr;
    result->missingContrecPtr = missingContrecPtr;
 
    result->standby_signal_file_found = standby_signal_file_found;
    result->recovery_signal_file_found = recovery_signal_file_found;
 
    return result;
}

References abortedRecPtr, EndOfWalRecoveryInfo::abortedRecPtr, ArchiveRecoveryRequested, Assert(), CheckPointLoc, CheckPointTLI, close, EndOfWalRecoveryInfo::endOfLog, EndOfWalRecoveryInfo::endOfLogTLI, XLogReaderState::EndRecPtr, getRecoveryStopReason(), InArchiveRecovery, InRecovery, EndOfWalRecoveryInfo::lastPage, EndOfWalRecoveryInfo::lastPageBeginPtr, EndOfWalRecoveryInfo::lastRec, EndOfWalRecoveryInfo::lastRecTLI, XLogRecoveryCtlData::lastReplayedReadRecPtr, XLogRecoveryCtlData::lastReplayedTLI, len, missingContrecPtr, EndOfWalRecoveryInfo::missingContrecPtr, palloc(), PANIC, XLogReaderState::readBuf, readFile, readOff, ReadRecord(), recovery_signal_file_found, EndOfWalRecoveryInfo::recovery_signal_file_found, EndOfWalRecoveryInfo::recoveryStopReason, XLogReaderState::seg, standby_signal_file_found, EndOfWalRecoveryInfo::standby_signal_file_found, StandbyMode, wal_segment_size, WalRcvStreaming(), WALOpenSegment::ws_tli, xlogprefetcher, XLogPrefetcherBeginRead(), xlogreader, XLogRecoveryCtl, XLogSegmentOffset, and XLogShutdownWalRcv().

Referenced by StartupXLOG().

GetCurrentChunkReplayStartTime()

TimestampTz GetCurrentChunkReplayStartTime

(

void

)

Definition at line 4570 of file xlogrecovery.c.

{
    TimestampTz xtime;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    xtime = XLogRecoveryCtl->currentChunkStartTime;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    return xtime;
}

References XLogRecoveryCtlData::currentChunkStartTime, XLogRecoveryCtlData::info_lck, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by GetReplicationApplyDelay().

GetCurrentReplayRecPtr()

XLogRecPtr GetCurrentReplayRecPtr

(

TimeLineID *

replayEndTLI

)

Definition at line 4506 of file xlogrecovery.c.

{
    XLogRecPtr  recptr;
    TimeLineID  tli;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    recptr = XLogRecoveryCtl->replayEndRecPtr;
    tli = XLogRecoveryCtl->replayEndTLI;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    if (replayEndTLI)
        *replayEndTLI = tli;
    return recptr;
}

References XLogRecoveryCtlData::info_lck, XLogRecoveryCtlData::replayEndRecPtr, XLogRecoveryCtlData::replayEndTLI, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by UpdateMinRecoveryPoint(), and xlog_redo().

GetLatestXTime()

TimestampTz GetLatestXTime

(

void

)

Definition at line 4540 of file xlogrecovery.c.

{
    TimestampTz xtime;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    xtime = XLogRecoveryCtl->recoveryLastXTime;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    return xtime;
}

References XLogRecoveryCtlData::info_lck, XLogRecoveryCtlData::recoveryLastXTime, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by CreateRestartPoint(), PerformWalRecovery(), and pg_last_xact_replay_timestamp().

GetRecoveryPauseState()

RecoveryPauseState GetRecoveryPauseState

(

void

)

Definition at line 3014 of file xlogrecovery.c.

{
    RecoveryPauseState state;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    state = XLogRecoveryCtl->recoveryPauseState;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    return state;
}

References XLogRecoveryCtlData::info_lck, XLogRecoveryCtlData::recoveryPauseState, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by pg_get_wal_replay_pause_state(), pg_is_wal_replay_paused(), recoveryPausesHere(), and RecoveryRequiresIntParameter().

GetXLogReceiptTime()

void GetXLogReceiptTime	(	TimestampTz *	rtime,
		bool *	fromStream
	)

Definition at line 4586 of file xlogrecovery.c.

{
    /*
     * This must be executed in the startup process, since we don't export the
     * relevant state to shared memory.
     */
    Assert(InRecovery);
 
    *rtime = XLogReceiptTime;
    *fromStream = (XLogReceiptSource == XLOG_FROM_STREAM);
}

References Assert(), InRecovery, XLOG_FROM_STREAM, XLogReceiptSource, and XLogReceiptTime.

Referenced by GetStandbyLimitTime().

GetXLogReplayRecPtr()

XLogRecPtr GetXLogReplayRecPtr

(

TimeLineID *

replayTLI

)

Definition at line 4483 of file xlogrecovery.c.

{
    XLogRecPtr  recptr;
    TimeLineID  tli;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    recptr = XLogRecoveryCtl->lastReplayedEndRecPtr;
    tli = XLogRecoveryCtl->lastReplayedTLI;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    if (replayTLI)
        *replayTLI = tli;
    return recptr;
}

References XLogRecoveryCtlData::info_lck, XLogRecoveryCtlData::lastReplayedEndRecPtr, XLogRecoveryCtlData::lastReplayedTLI, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by CheckpointerMain(), CreateRestartPoint(), GetCurrentLSN(), GetReplicationApplyDelay(), GetStandbyFlushRecPtr(), IsCheckpointOnSchedule(), logical_read_xlog_page(), pg_last_wal_replay_lsn(), pg_logical_slot_get_changes_guts(), pg_replication_slot_advance(), read_local_xlog_page_guts(), ReadReplicationSlot(), ReplicationSlotReserveWal(), WalReceiverMain(), WalSndWaitForWal(), and XLogWalRcvSendReply().

HotStandbyActive()

bool HotStandbyActive

(

void

)

Definition at line 4446 of file xlogrecovery.c.

{
    /*
     * We check shared state each time only until Hot Standby is active. We
     * can't de-activate Hot Standby, so there's no need to keep checking
     * after the shared variable has once been seen true.
     */
    if (LocalHotStandbyActive)
        return true;
    else
    {
        /* spinlock is essential on machines with weak memory ordering! */
        SpinLockAcquire(&XLogRecoveryCtl->info_lck);
        LocalHotStandbyActive = XLogRecoveryCtl->SharedHotStandbyActive;
        SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
        return LocalHotStandbyActive;
    }
}

References XLogRecoveryCtlData::info_lck, LocalHotStandbyActive, XLogRecoveryCtlData::SharedHotStandbyActive, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by XLogWalRcvSendHSFeedback().

InitWalRecovery()

void InitWalRecovery	(	ControlFileData *	ControlFile,
		bool *	wasShutdown_ptr,
		bool *	haveBackupLabel_ptr,
		bool *	haveTblspcMap_ptr
	)

Definition at line 512 of file xlogrecovery.c.

{
    XLogPageReadPrivate *private;
    struct stat st;
    bool        wasShutdown;
    XLogRecord *record;
    DBState     dbstate_at_startup;
    bool        haveTblspcMap = false;
    bool        haveBackupLabel = false;
    CheckPoint  checkPoint;
    bool        backupFromStandby = false;
 
    dbstate_at_startup = ControlFile->state;
 
    /*
     * Initialize on the assumption we want to recover to the latest timeline
     * that's active according to pg_control.
     */
    if (ControlFile->minRecoveryPointTLI >
        ControlFile->checkPointCopy.ThisTimeLineID)
        recoveryTargetTLI = ControlFile->minRecoveryPointTLI;
    else
        recoveryTargetTLI = ControlFile->checkPointCopy.ThisTimeLineID;
 
    /*
     * Check for signal files, and if so set up state for offline recovery
     */
    readRecoverySignalFile();
    validateRecoveryParameters();
 
    /*
     * Take ownership of the wakeup latch if we're going to sleep during
     * recovery, if required.
     */
    if (ArchiveRecoveryRequested)
        OwnLatch(&XLogRecoveryCtl->recoveryWakeupLatch);
 
    /*
     * Set the WAL reading processor now, as it will be needed when reading
     * the checkpoint record required (backup_label or not).
     */
    private = palloc0(sizeof(XLogPageReadPrivate));
    xlogreader =
        XLogReaderAllocate(wal_segment_size, NULL,
                           XL_ROUTINE(.page_read = &XLogPageRead,
                                      .segment_open = NULL,
                                      .segment_close = wal_segment_close),
                           private);
    if (!xlogreader)
        ereport(ERROR,
                (errcode(ERRCODE_OUT_OF_MEMORY),
                 errmsg("out of memory"),
                 errdetail("Failed while allocating a WAL reading processor.")));
    xlogreader->system_identifier = ControlFile->system_identifier;
 
    /*
     * Set the WAL decode buffer size.  This limits how far ahead we can read
     * in the WAL.
     */
    XLogReaderSetDecodeBuffer(xlogreader, NULL, wal_decode_buffer_size);
 
    /* Create a WAL prefetcher. */
    xlogprefetcher = XLogPrefetcherAllocate(xlogreader);
 
    /*
     * Allocate two page buffers dedicated to WAL consistency checks.  We do
     * it this way, rather than just making static arrays, for two reasons:
     * (1) no need to waste the storage in most instantiations of the backend;
     * (2) a static char array isn't guaranteed to have any particular
     * alignment, whereas palloc() will provide MAXALIGN'd storage.
     */
    replay_image_masked = (char *) palloc(BLCKSZ);
    primary_image_masked = (char *) palloc(BLCKSZ);
 
    /*
     * Read the backup_label file.  We want to run this part of the recovery
     * process after checking for signal files and after performing validation
     * of the recovery parameters.
     */
    if (read_backup_label(&CheckPointLoc, &CheckPointTLI, &backupEndRequired,
                          &backupFromStandby))
    {
        List       *tablespaces = NIL;
 
        /*
         * Archive recovery was requested, and thanks to the backup label
         * file, we know how far we need to replay to reach consistency. Enter
         * archive recovery directly.
         */
        InArchiveRecovery = true;
        if (StandbyModeRequested)
            EnableStandbyMode();
 
        /*
         * When a backup_label file is present, we want to roll forward from
         * the checkpoint it identifies, rather than using pg_control.
         */
        record = ReadCheckpointRecord(xlogprefetcher, CheckPointLoc,
                                      CheckPointTLI);
        if (record != NULL)
        {
            memcpy(&checkPoint, XLogRecGetData(xlogreader), sizeof(CheckPoint));
            wasShutdown = ((record->xl_info & ~XLR_INFO_MASK) == XLOG_CHECKPOINT_SHUTDOWN);
            ereport(DEBUG1,
                    (errmsg_internal("checkpoint record is at %X/%X",
                                     LSN_FORMAT_ARGS(CheckPointLoc))));
            InRecovery = true;  /* force recovery even if SHUTDOWNED */
 
            /*
             * Make sure that REDO location exists. This may not be the case
             * if there was a crash during an online backup, which left a
             * backup_label around that references a WAL segment that's
             * already been archived.
             */
            if (checkPoint.redo < CheckPointLoc)
            {
                XLogPrefetcherBeginRead(xlogprefetcher, checkPoint.redo);
                if (!ReadRecord(xlogprefetcher, LOG, false,
                                checkPoint.ThisTimeLineID))
                    ereport(FATAL,
                            (errmsg("could not find redo location referenced by checkpoint record"),
                             errhint("If you are restoring from a backup, touch \"%s/recovery.signal\" or \"%s/standby.signal\" and add required recovery options.\n"
                                     "If you are not restoring from a backup, try removing the file \"%s/backup_label\".\n"
                                     "Be careful: removing \"%s/backup_label\" will result in a corrupt cluster if restoring from a backup.",
                                     DataDir, DataDir, DataDir, DataDir)));
            }
        }
        else
        {
            ereport(FATAL,
                    (errmsg("could not locate required checkpoint record"),
                     errhint("If you are restoring from a backup, touch \"%s/recovery.signal\" or \"%s/standby.signal\" and add required recovery options.\n"
                             "If you are not restoring from a backup, try removing the file \"%s/backup_label\".\n"
                             "Be careful: removing \"%s/backup_label\" will result in a corrupt cluster if restoring from a backup.",
                             DataDir, DataDir, DataDir, DataDir)));
            wasShutdown = false;    /* keep compiler quiet */
        }
 
        /* Read the tablespace_map file if present and create symlinks. */
        if (read_tablespace_map(&tablespaces))
        {
            ListCell   *lc;
 
            foreach(lc, tablespaces)
            {
                tablespaceinfo *ti = lfirst(lc);
                char       *linkloc;
 
                linkloc = psprintf("pg_tblspc/%u", ti->oid);
 
                /*
                 * Remove the existing symlink if any and Create the symlink
                 * under PGDATA.
                 */
                remove_tablespace_symlink(linkloc);
 
                if (symlink(ti->path, linkloc) < 0)
                    ereport(ERROR,
                            (errcode_for_file_access(),
                             errmsg("could not create symbolic link \"%s\": %m",
                                    linkloc)));
 
                pfree(ti->path);
                pfree(ti);
            }
 
            /* tell the caller to delete it later */
            haveTblspcMap = true;
        }
 
        /* tell the caller to delete it later */
        haveBackupLabel = true;
    }
    else
    {
        /* No backup_label file has been found if we are here. */
 
        /*
         * If tablespace_map file is present without backup_label file, there
         * is no use of such file.  There is no harm in retaining it, but it
         * is better to get rid of the map file so that we don't have any
         * redundant file in data directory and it will avoid any sort of
         * confusion.  It seems prudent though to just rename the file out of
         * the way rather than delete it completely, also we ignore any error
         * that occurs in rename operation as even if map file is present
         * without backup_label file, it is harmless.
         */
        if (stat(TABLESPACE_MAP, &st) == 0)
        {
            unlink(TABLESPACE_MAP_OLD);
            if (durable_rename(TABLESPACE_MAP, TABLESPACE_MAP_OLD, DEBUG1) == 0)
                ereport(LOG,
                        (errmsg("ignoring file \"%s\" because no file \"%s\" exists",
                                TABLESPACE_MAP, BACKUP_LABEL_FILE),
                         errdetail("File \"%s\" was renamed to \"%s\".",
                                   TABLESPACE_MAP, TABLESPACE_MAP_OLD)));
            else
                ereport(LOG,
                        (errmsg("ignoring file \"%s\" because no file \"%s\" exists",
                                TABLESPACE_MAP, BACKUP_LABEL_FILE),
                         errdetail("Could not rename file \"%s\" to \"%s\": %m.",
                                   TABLESPACE_MAP, TABLESPACE_MAP_OLD)));
        }
 
        /*
         * It's possible that archive recovery was requested, but we don't
         * know how far we need to replay the WAL before we reach consistency.
         * This can happen for example if a base backup is taken from a
         * running server using an atomic filesystem snapshot, without calling
         * pg_backup_start/stop. Or if you just kill a running primary server
         * and put it into archive recovery by creating a recovery signal
         * file.
         *
         * Our strategy in that case is to perform crash recovery first,
         * replaying all the WAL present in pg_wal, and only enter archive
         * recovery after that.
         *
         * But usually we already know how far we need to replay the WAL (up
         * to minRecoveryPoint, up to backupEndPoint, or until we see an
         * end-of-backup record), and we can enter archive recovery directly.
         */
        if (ArchiveRecoveryRequested &&
            (ControlFile->minRecoveryPoint != InvalidXLogRecPtr ||
             ControlFile->backupEndRequired ||
             ControlFile->backupEndPoint != InvalidXLogRecPtr ||
             ControlFile->state == DB_SHUTDOWNED))
        {
            InArchiveRecovery = true;
            if (StandbyModeRequested)
                EnableStandbyMode();
        }
 
        /* Get the last valid checkpoint record. */
        CheckPointLoc = ControlFile->checkPoint;
        CheckPointTLI = ControlFile->checkPointCopy.ThisTimeLineID;
        RedoStartLSN = ControlFile->checkPointCopy.redo;
        RedoStartTLI = ControlFile->checkPointCopy.ThisTimeLineID;
        record = ReadCheckpointRecord(xlogprefetcher, CheckPointLoc,
                                      CheckPointTLI);
        if (record != NULL)
        {
            ereport(DEBUG1,
                    (errmsg_internal("checkpoint record is at %X/%X",
                                     LSN_FORMAT_ARGS(CheckPointLoc))));
        }
        else
        {
            /*
             * We used to attempt to go back to a secondary checkpoint record
             * here, but only when not in standby mode. We now just fail if we
             * can't read the last checkpoint because this allows us to
             * simplify processing around checkpoints.
             */
            ereport(PANIC,
                    (errmsg("could not locate a valid checkpoint record")));
        }
        memcpy(&checkPoint, XLogRecGetData(xlogreader), sizeof(CheckPoint));
        wasShutdown = ((record->xl_info & ~XLR_INFO_MASK) == XLOG_CHECKPOINT_SHUTDOWN);
    }
 
    if (ArchiveRecoveryRequested)
    {
        if (StandbyModeRequested)
            ereport(LOG,
                    (errmsg("entering standby mode")));
        else if (recoveryTarget == RECOVERY_TARGET_XID)
            ereport(LOG,
                    (errmsg("starting point-in-time recovery to XID %u",
                            recoveryTargetXid)));
        else if (recoveryTarget == RECOVERY_TARGET_TIME)
            ereport(LOG,
                    (errmsg("starting point-in-time recovery to %s",
                            timestamptz_to_str(recoveryTargetTime))));
        else if (recoveryTarget == RECOVERY_TARGET_NAME)
            ereport(LOG,
                    (errmsg("starting point-in-time recovery to \"%s\"",
                            recoveryTargetName)));
        else if (recoveryTarget == RECOVERY_TARGET_LSN)
            ereport(LOG,
                    (errmsg("starting point-in-time recovery to WAL location (LSN) \"%X/%X\"",
                            LSN_FORMAT_ARGS(recoveryTargetLSN))));
        else if (recoveryTarget == RECOVERY_TARGET_IMMEDIATE)
            ereport(LOG,
                    (errmsg("starting point-in-time recovery to earliest consistent point")));
        else
            ereport(LOG,
                    (errmsg("starting archive recovery")));
    }
 
    /*
     * If the location of the checkpoint record is not on the expected
     * timeline in the history of the requested timeline, we cannot proceed:
     * the backup is not part of the history of the requested timeline.
     */
    Assert(expectedTLEs);       /* was initialized by reading checkpoint
                                 * record */
    if (tliOfPointInHistory(CheckPointLoc, expectedTLEs) !=
        CheckPointTLI)
    {
        XLogRecPtr  switchpoint;
 
        /*
         * tliSwitchPoint will throw an error if the checkpoint's timeline is
         * not in expectedTLEs at all.
         */
        switchpoint = tliSwitchPoint(ControlFile->checkPointCopy.ThisTimeLineID, expectedTLEs, NULL);
        ereport(FATAL,
                (errmsg("requested timeline %u is not a child of this server's history",
                        recoveryTargetTLI),
                 errdetail("Latest checkpoint is at %X/%X on timeline %u, but in the history of the requested timeline, the server forked off from that timeline at %X/%X.",
                           LSN_FORMAT_ARGS(ControlFile->checkPoint),
                           ControlFile->checkPointCopy.ThisTimeLineID,
                           LSN_FORMAT_ARGS(switchpoint))));
    }
 
    /*
     * The min recovery point should be part of the requested timeline's
     * history, too.
     */
    if (!XLogRecPtrIsInvalid(ControlFile->minRecoveryPoint) &&
        tliOfPointInHistory(ControlFile->minRecoveryPoint - 1, expectedTLEs) !=
        ControlFile->minRecoveryPointTLI)
        ereport(FATAL,
                (errmsg("requested timeline %u does not contain minimum recovery point %X/%X on timeline %u",
                        recoveryTargetTLI,
                        LSN_FORMAT_ARGS(ControlFile->minRecoveryPoint),
                        ControlFile->minRecoveryPointTLI)));
 
    ereport(DEBUG1,
            (errmsg_internal("redo record is at %X/%X; shutdown %s",
                             LSN_FORMAT_ARGS(checkPoint.redo),
                             wasShutdown ? "true" : "false")));
    ereport(DEBUG1,
            (errmsg_internal("next transaction ID: " UINT64_FORMAT "; next OID: %u",
                             U64FromFullTransactionId(checkPoint.nextXid),
                             checkPoint.nextOid)));
    ereport(DEBUG1,
            (errmsg_internal("next MultiXactId: %u; next MultiXactOffset: %u",
                             checkPoint.nextMulti, checkPoint.nextMultiOffset)));
    ereport(DEBUG1,
            (errmsg_internal("oldest unfrozen transaction ID: %u, in database %u",
                             checkPoint.oldestXid, checkPoint.oldestXidDB)));
    ereport(DEBUG1,
            (errmsg_internal("oldest MultiXactId: %u, in database %u",
                             checkPoint.oldestMulti, checkPoint.oldestMultiDB)));
    ereport(DEBUG1,
            (errmsg_internal("commit timestamp Xid oldest/newest: %u/%u",
                             checkPoint.oldestCommitTsXid,
                             checkPoint.newestCommitTsXid)));
    if (!TransactionIdIsNormal(XidFromFullTransactionId(checkPoint.nextXid)))
        ereport(PANIC,
                (errmsg("invalid next transaction ID")));
 
    /* sanity check */
    if (checkPoint.redo > CheckPointLoc)
        ereport(PANIC,
                (errmsg("invalid redo in checkpoint record")));
 
    /*
     * Check whether we need to force recovery from WAL.  If it appears to
     * have been a clean shutdown and we did not have a recovery signal file,
     * then assume no recovery needed.
     */
    if (checkPoint.redo < CheckPointLoc)
    {
        if (wasShutdown)
            ereport(PANIC,
                    (errmsg("invalid redo record in shutdown checkpoint")));
        InRecovery = true;
    }
    else if (ControlFile->state != DB_SHUTDOWNED)
        InRecovery = true;
    else if (ArchiveRecoveryRequested)
    {
        /* force recovery due to presence of recovery signal file */
        InRecovery = true;
    }
 
    /*
     * If recovery is needed, update our in-memory copy of pg_control to show
     * that we are recovering and to show the selected checkpoint as the place
     * we are starting from. We also mark pg_control with any minimum recovery
     * stop point obtained from a backup history file.
     *
     * We don't write the changes to disk yet, though. Only do that after
     * initializing various subsystems.
     */
    if (InRecovery)
    {
        if (InArchiveRecovery)
        {
            ControlFile->state = DB_IN_ARCHIVE_RECOVERY;
        }
        else
        {
            ereport(LOG,
                    (errmsg("database system was not properly shut down; "
                            "automatic recovery in progress")));
            if (recoveryTargetTLI > ControlFile->checkPointCopy.ThisTimeLineID)
                ereport(LOG,
                        (errmsg("crash recovery starts in timeline %u "
                                "and has target timeline %u",
                                ControlFile->checkPointCopy.ThisTimeLineID,
                                recoveryTargetTLI)));
            ControlFile->state = DB_IN_CRASH_RECOVERY;
        }
        ControlFile->checkPoint = CheckPointLoc;
        ControlFile->checkPointCopy = checkPoint;
        if (InArchiveRecovery)
        {
            /* initialize minRecoveryPoint if not set yet */
            if (ControlFile->minRecoveryPoint < checkPoint.redo)
            {
                ControlFile->minRecoveryPoint = checkPoint.redo;
                ControlFile->minRecoveryPointTLI = checkPoint.ThisTimeLineID;
            }
        }
 
        /*
         * Set backupStartPoint if we're starting recovery from a base backup.
         *
         * Also set backupEndPoint and use minRecoveryPoint as the backup end
         * location if we're starting recovery from a base backup which was
         * taken from a standby. In this case, the database system status in
         * pg_control must indicate that the database was already in recovery.
         * Usually that will be DB_IN_ARCHIVE_RECOVERY but also can be
         * DB_SHUTDOWNED_IN_RECOVERY if recovery previously was interrupted
         * before reaching this point; e.g. because restore_command or
         * primary_conninfo were faulty.
         *
         * Any other state indicates that the backup somehow became corrupted
         * and we can't sensibly continue with recovery.
         */
        if (haveBackupLabel)
        {
            ControlFile->backupStartPoint = checkPoint.redo;
            ControlFile->backupEndRequired = backupEndRequired;
 
            if (backupFromStandby)
            {
                if (dbstate_at_startup != DB_IN_ARCHIVE_RECOVERY &&
                    dbstate_at_startup != DB_SHUTDOWNED_IN_RECOVERY)
                    ereport(FATAL,
                            (errmsg("backup_label contains data inconsistent with control file"),
                             errhint("This means that the backup is corrupted and you will "
                                     "have to use another backup for recovery.")));
                ControlFile->backupEndPoint = ControlFile->minRecoveryPoint;
            }
        }
    }
 
    /* remember these, so that we know when we have reached consistency */
    backupStartPoint = ControlFile->backupStartPoint;
    backupEndRequired = ControlFile->backupEndRequired;
    backupEndPoint = ControlFile->backupEndPoint;
    if (InArchiveRecovery)
    {
        minRecoveryPoint = ControlFile->minRecoveryPoint;
        minRecoveryPointTLI = ControlFile->minRecoveryPointTLI;
    }
    else
    {
        minRecoveryPoint = InvalidXLogRecPtr;
        minRecoveryPointTLI = 0;
    }
 
    /*
     * Start recovery assuming that the final record isn't lost.
     */
    abortedRecPtr = InvalidXLogRecPtr;
    missingContrecPtr = InvalidXLogRecPtr;
 
    *wasShutdown_ptr = wasShutdown;
    *haveBackupLabel_ptr = haveBackupLabel;
    *haveTblspcMap_ptr = haveTblspcMap;
}

References abortedRecPtr, ArchiveRecoveryRequested, Assert(), BACKUP_LABEL_FILE, backupEndPoint, ControlFileData::backupEndPoint, backupEndRequired, ControlFileData::backupEndRequired, backupStartPoint, ControlFileData::backupStartPoint, ControlFileData::checkPoint, ControlFileData::checkPointCopy, CheckPointLoc, CheckPointTLI, ControlFile, DataDir, DB_IN_ARCHIVE_RECOVERY, DB_IN_CRASH_RECOVERY, DB_SHUTDOWNED, DB_SHUTDOWNED_IN_RECOVERY, DEBUG1, durable_rename(), EnableStandbyMode(), ereport, errcode(), errcode_for_file_access(), errdetail(), errhint(), errmsg(), errmsg_internal(), ERROR, expectedTLEs, FATAL, InArchiveRecovery, InRecovery, InvalidXLogRecPtr, lfirst, LOG, LSN_FORMAT_ARGS, minRecoveryPoint, ControlFileData::minRecoveryPoint, minRecoveryPointTLI, ControlFileData::minRecoveryPointTLI, missingContrecPtr, CheckPoint::newestCommitTsXid, CheckPoint::nextMulti, CheckPoint::nextMultiOffset, CheckPoint::nextOid, CheckPoint::nextXid, NIL, tablespaceinfo::oid, CheckPoint::oldestCommitTsXid, CheckPoint::oldestMulti, CheckPoint::oldestMultiDB, CheckPoint::oldestXid, CheckPoint::oldestXidDB, OwnLatch(), palloc(), palloc0(), PANIC, tablespaceinfo::path, pfree(), primary_image_masked, psprintf(), read_backup_label(), read_tablespace_map(), ReadCheckpointRecord(), ReadRecord(), readRecoverySignalFile(), RECOVERY_TARGET_IMMEDIATE, RECOVERY_TARGET_LSN, RECOVERY_TARGET_NAME, RECOVERY_TARGET_TIME, RECOVERY_TARGET_XID, recoveryTarget, recoveryTargetLSN, recoveryTargetName, recoveryTargetTime, recoveryTargetTLI, recoveryTargetXid, XLogRecoveryCtlData::recoveryWakeupLatch, CheckPoint::redo, RedoStartLSN, RedoStartTLI, remove_tablespace_symlink(), replay_image_masked, StandbyModeRequested, stat, ControlFileData::state, symlink, XLogReaderState::system_identifier, ControlFileData::system_identifier, TABLESPACE_MAP, TABLESPACE_MAP_OLD, CheckPoint::ThisTimeLineID, timestamptz_to_str(), tliOfPointInHistory(), tliSwitchPoint(), TransactionIdIsNormal, U64FromFullTransactionId, UINT64_FORMAT, validateRecoveryParameters(), wal_decode_buffer_size, wal_segment_close(), wal_segment_size, XidFromFullTransactionId, XLogRecord::xl_info, XL_ROUTINE, XLOG_CHECKPOINT_SHUTDOWN, XLogPageRead(), xlogprefetcher, XLogPrefetcherAllocate(), XLogPrefetcherBeginRead(), xlogreader, XLogReaderAllocate(), XLogReaderSetDecodeBuffer(), XLogRecGetData, XLogRecoveryCtl, XLogRecPtrIsInvalid, and XLR_INFO_MASK.

Referenced by StartupXLOG().

PerformWalRecovery()

void PerformWalRecovery

(

void

)

Definition at line 1602 of file xlogrecovery.c.

{
    XLogRecord *record;
    bool        reachedRecoveryTarget = false;
    TimeLineID  replayTLI;
 
    /*
     * Initialize shared variables for tracking progress of WAL replay, as if
     * we had just replayed the record before the REDO location (or the
     * checkpoint record itself, if it's a shutdown checkpoint).
     */
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    if (RedoStartLSN < CheckPointLoc)
    {
        XLogRecoveryCtl->lastReplayedReadRecPtr = InvalidXLogRecPtr;
        XLogRecoveryCtl->lastReplayedEndRecPtr = RedoStartLSN;
        XLogRecoveryCtl->lastReplayedTLI = RedoStartTLI;
    }
    else
    {
        XLogRecoveryCtl->lastReplayedReadRecPtr = xlogreader->ReadRecPtr;
        XLogRecoveryCtl->lastReplayedEndRecPtr = xlogreader->EndRecPtr;
        XLogRecoveryCtl->lastReplayedTLI = CheckPointTLI;
    }
    XLogRecoveryCtl->replayEndRecPtr = XLogRecoveryCtl->lastReplayedEndRecPtr;
    XLogRecoveryCtl->replayEndTLI = XLogRecoveryCtl->lastReplayedTLI;
    XLogRecoveryCtl->recoveryLastXTime = 0;
    XLogRecoveryCtl->currentChunkStartTime = 0;
    XLogRecoveryCtl->recoveryPauseState = RECOVERY_NOT_PAUSED;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    /* Also ensure XLogReceiptTime has a sane value */
    XLogReceiptTime = GetCurrentTimestamp();
 
    /*
     * Let postmaster know we've started redo now, so that it can launch the
     * archiver if necessary.
     */
    if (IsUnderPostmaster)
        SendPostmasterSignal(PMSIGNAL_RECOVERY_STARTED);
 
    /*
     * Allow read-only connections immediately if we're consistent already.
     */
    CheckRecoveryConsistency();
 
    /*
     * Find the first record that logically follows the checkpoint --- it
     * might physically precede it, though.
     */
    if (RedoStartLSN < CheckPointLoc)
    {
        /* back up to find the record */
        replayTLI = RedoStartTLI;
        XLogPrefetcherBeginRead(xlogprefetcher, RedoStartLSN);
        record = ReadRecord(xlogprefetcher, PANIC, false, replayTLI);
 
        /*
         * If a checkpoint record's redo pointer points back to an earlier
         * LSN, the record at that LSN should be an XLOG_CHECKPOINT_REDO
         * record.
         */
        if (record->xl_rmid != RM_XLOG_ID ||
            (record->xl_info & ~XLR_INFO_MASK) != XLOG_CHECKPOINT_REDO)
            ereport(FATAL,
                    (errmsg("unexpected record type found at redo point %X/%X",
                            LSN_FORMAT_ARGS(xlogreader->ReadRecPtr))));
    }
    else
    {
        /* just have to read next record after CheckPoint */
        Assert(xlogreader->ReadRecPtr == CheckPointLoc);
        replayTLI = CheckPointTLI;
        record = ReadRecord(xlogprefetcher, LOG, false, replayTLI);
    }
 
    if (record != NULL)
    {
        TimestampTz xtime;
        PGRUsage    ru0;
 
        pg_rusage_init(&ru0);
 
        InRedo = true;
 
        RmgrStartup();
 
        ereport(LOG,
                (errmsg("redo starts at %X/%X",
                        LSN_FORMAT_ARGS(xlogreader->ReadRecPtr))));
 
        /* Prepare to report progress of the redo phase. */
        if (!StandbyMode)
            begin_startup_progress_phase();
 
        /*
         * main redo apply loop
         */
        do
        {
            if (!StandbyMode)
                ereport_startup_progress("redo in progress, elapsed time: %ld.%02d s, current LSN: %X/%X",
                                         LSN_FORMAT_ARGS(xlogreader->ReadRecPtr));
 
#ifdef WAL_DEBUG
            if (XLOG_DEBUG ||
                (record->xl_rmid == RM_XACT_ID && trace_recovery_messages <= DEBUG2) ||
                (record->xl_rmid != RM_XACT_ID && trace_recovery_messages <= DEBUG3))
            {
                StringInfoData buf;
 
                initStringInfo(&buf);
                appendStringInfo(&buf, "REDO @ %X/%X; LSN %X/%X: ",
                                 LSN_FORMAT_ARGS(xlogreader->ReadRecPtr),
                                 LSN_FORMAT_ARGS(xlogreader->EndRecPtr));
                xlog_outrec(&buf, xlogreader);
                appendStringInfoString(&buf, " - ");
                xlog_outdesc(&buf, xlogreader);
                elog(LOG, "%s", buf.data);
                pfree(buf.data);
            }
#endif
 
            /* Handle interrupt signals of startup process */
            HandleStartupProcInterrupts();
 
            /*
             * Pause WAL replay, if requested by a hot-standby session via
             * SetRecoveryPause().
             *
             * Note that we intentionally don't take the info_lck spinlock
             * here.  We might therefore read a slightly stale value of the
             * recoveryPause flag, but it can't be very stale (no worse than
             * the last spinlock we did acquire).  Since a pause request is a
             * pretty asynchronous thing anyway, possibly responding to it one
             * WAL record later than we otherwise would is a minor issue, so
             * it doesn't seem worth adding another spinlock cycle to prevent
             * that.
             */
            if (((volatile XLogRecoveryCtlData *) XLogRecoveryCtl)->recoveryPauseState !=
                RECOVERY_NOT_PAUSED)
                recoveryPausesHere(false);
 
            /*
             * Have we reached our recovery target?
             */
            if (recoveryStopsBefore(xlogreader))
            {
                reachedRecoveryTarget = true;
                break;
            }
 
            /*
             * If we've been asked to lag the primary, wait on latch until
             * enough time has passed.
             */
            if (recoveryApplyDelay(xlogreader))
            {
                /*
                 * We test for paused recovery again here. If user sets
                 * delayed apply, it may be because they expect to pause
                 * recovery in case of problems, so we must test again here
                 * otherwise pausing during the delay-wait wouldn't work.
                 */
                if (((volatile XLogRecoveryCtlData *) XLogRecoveryCtl)->recoveryPauseState !=
                    RECOVERY_NOT_PAUSED)
                    recoveryPausesHere(false);
            }
 
            /*
             * Apply the record
             */
            ApplyWalRecord(xlogreader, record, &replayTLI);
 
            /* Exit loop if we reached inclusive recovery target */
            if (recoveryStopsAfter(xlogreader))
            {
                reachedRecoveryTarget = true;
                break;
            }
 
            /* Else, try to fetch the next WAL record */
            record = ReadRecord(xlogprefetcher, LOG, false, replayTLI);
        } while (record != NULL);
 
        /*
         * end of main redo apply loop
         */
 
        if (reachedRecoveryTarget)
        {
            if (!reachedConsistency)
                ereport(FATAL,
                        (errmsg("requested recovery stop point is before consistent recovery point")));
 
            /*
             * This is the last point where we can restart recovery with a new
             * recovery target, if we shutdown and begin again. After this,
             * Resource Managers may choose to do permanent corrective actions
             * at end of recovery.
             */
            switch (recoveryTargetAction)
            {
                case RECOVERY_TARGET_ACTION_SHUTDOWN:
 
                    /*
                     * exit with special return code to request shutdown of
                     * postmaster.  Log messages issued from postmaster.
                     */
                    proc_exit(3);
 
                case RECOVERY_TARGET_ACTION_PAUSE:
                    SetRecoveryPause(true);
                    recoveryPausesHere(true);
 
                    /* drop into promote */
 
                case RECOVERY_TARGET_ACTION_PROMOTE:
                    break;
            }
        }
 
        RmgrCleanup();
 
        ereport(LOG,
                (errmsg("redo done at %X/%X system usage: %s",
                        LSN_FORMAT_ARGS(xlogreader->ReadRecPtr),
                        pg_rusage_show(&ru0))));
        xtime = GetLatestXTime();
        if (xtime)
            ereport(LOG,
                    (errmsg("last completed transaction was at log time %s",
                            timestamptz_to_str(xtime))));
 
        InRedo = false;
    }
    else
    {
        /* there are no WAL records following the checkpoint */
        ereport(LOG,
                (errmsg("redo is not required")));
    }
 
    /*
     * This check is intentionally after the above log messages that indicate
     * how far recovery went.
     */
    if (ArchiveRecoveryRequested &&
        recoveryTarget != RECOVERY_TARGET_UNSET &&
        !reachedRecoveryTarget)
        ereport(FATAL,
                (errmsg("recovery ended before configured recovery target was reached")));
}

References appendStringInfo(), appendStringInfoString(), ApplyWalRecord(), ArchiveRecoveryRequested, Assert(), begin_startup_progress_phase(), buf, CheckPointLoc, CheckPointTLI, CheckRecoveryConsistency(), XLogRecoveryCtlData::currentChunkStartTime, DEBUG2, DEBUG3, elog(), XLogReaderState::EndRecPtr, ereport, ereport_startup_progress, errmsg(), FATAL, GetCurrentTimestamp(), GetLatestXTime(), HandleStartupProcInterrupts(), XLogRecoveryCtlData::info_lck, initStringInfo(), InRedo, InvalidXLogRecPtr, IsUnderPostmaster, XLogRecoveryCtlData::lastReplayedEndRecPtr, XLogRecoveryCtlData::lastReplayedReadRecPtr, XLogRecoveryCtlData::lastReplayedTLI, LOG, LSN_FORMAT_ARGS, PANIC, pfree(), pg_rusage_init(), pg_rusage_show(), PMSIGNAL_RECOVERY_STARTED, proc_exit(), reachedConsistency, ReadRecord(), XLogReaderState::ReadRecPtr, RECOVERY_NOT_PAUSED, RECOVERY_TARGET_ACTION_PAUSE, RECOVERY_TARGET_ACTION_PROMOTE, RECOVERY_TARGET_ACTION_SHUTDOWN, RECOVERY_TARGET_UNSET, recoveryApplyDelay(), XLogRecoveryCtlData::recoveryLastXTime, recoveryPausesHere(), XLogRecoveryCtlData::recoveryPauseState, recoveryStopsAfter(), recoveryStopsBefore(), recoveryTarget, recoveryTargetAction, RedoStartLSN, RedoStartTLI, XLogRecoveryCtlData::replayEndRecPtr, XLogRecoveryCtlData::replayEndTLI, RmgrCleanup(), RmgrStartup(), SendPostmasterSignal(), SetRecoveryPause(), SpinLockAcquire, SpinLockRelease, StandbyMode, timestamptz_to_str(), trace_recovery_messages, XLogRecord::xl_info, XLogRecord::xl_rmid, XLOG_CHECKPOINT_REDO, xlog_outdesc(), xlogprefetcher, XLogPrefetcherBeginRead(), xlogreader, XLogReceiptTime, XLogRecoveryCtl, and XLR_INFO_MASK.

Referenced by StartupXLOG().

PromoteIsTriggered()

bool PromoteIsTriggered

(

void

)

Definition at line 4338 of file xlogrecovery.c.

{
    /*
     * We check shared state each time only until a standby promotion is
     * triggered. We can't trigger a promotion again, so there's no need to
     * keep checking after the shared variable has once been seen true.
     */
    if (LocalPromoteIsTriggered)
        return true;
 
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
    LocalPromoteIsTriggered = XLogRecoveryCtl->SharedPromoteIsTriggered;
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    return LocalPromoteIsTriggered;
}

References XLogRecoveryCtlData::info_lck, LocalPromoteIsTriggered, XLogRecoveryCtlData::SharedPromoteIsTriggered, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by PerformRecoveryXLogAction(), pg_wal_replay_pause(), and pg_wal_replay_resume().

RecoveryRequiresIntParameter()

void RecoveryRequiresIntParameter	(	const char *	param_name,
		int	currValue,
		int	minValue
	)

Definition at line 4603 of file xlogrecovery.c.

{
    if (currValue < minValue)
    {
        if (HotStandbyActiveInReplay())
        {
            bool        warned_for_promote = false;
 
            ereport(WARNING,
                    (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                     errmsg("hot standby is not possible because of insufficient parameter settings"),
                     errdetail("%s = %d is a lower setting than on the primary server, where its value was %d.",
                               param_name,
                               currValue,
                               minValue)));
 
            SetRecoveryPause(true);
 
            ereport(LOG,
                    (errmsg("recovery has paused"),
                     errdetail("If recovery is unpaused, the server will shut down."),
                     errhint("You can then restart the server after making the necessary configuration changes.")));
 
            while (GetRecoveryPauseState() != RECOVERY_NOT_PAUSED)
            {
                HandleStartupProcInterrupts();
 
                if (CheckForStandbyTrigger())
                {
                    if (!warned_for_promote)
                        ereport(WARNING,
                                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                 errmsg("promotion is not possible because of insufficient parameter settings"),
 
                        /*
                         * Repeat the detail from above so it's easy to find
                         * in the log.
                         */
                                 errdetail("%s = %d is a lower setting than on the primary server, where its value was %d.",
                                           param_name,
                                           currValue,
                                           minValue),
                                 errhint("Restart the server after making the necessary configuration changes.")));
                    warned_for_promote = true;
                }
 
                /*
                 * If recovery pause is requested then set it paused.  While
                 * we are in the loop, user might resume and pause again so
                 * set this every time.
                 */
                ConfirmRecoveryPaused();
 
                /*
                 * We wait on a condition variable that will wake us as soon
                 * as the pause ends, but we use a timeout so we can check the
                 * above conditions periodically too.
                 */
                ConditionVariableTimedSleep(&XLogRecoveryCtl->recoveryNotPausedCV, 1000,
                                            WAIT_EVENT_RECOVERY_PAUSE);
            }
            ConditionVariableCancelSleep();
        }
 
        ereport(FATAL,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("recovery aborted because of insufficient parameter settings"),
        /* Repeat the detail from above so it's easy to find in the log. */
                 errdetail("%s = %d is a lower setting than on the primary server, where its value was %d.",
                           param_name,
                           currValue,
                           minValue),
                 errhint("You can restart the server after making the necessary configuration changes.")));
    }
}

References CheckForStandbyTrigger(), ConditionVariableCancelSleep(), ConditionVariableTimedSleep(), ConfirmRecoveryPaused(), ereport, errcode(), errdetail(), errhint(), errmsg(), FATAL, GetRecoveryPauseState(), HandleStartupProcInterrupts(), HotStandbyActiveInReplay(), LOG, RECOVERY_NOT_PAUSED, XLogRecoveryCtlData::recoveryNotPausedCV, SetRecoveryPause(), WARNING, and XLogRecoveryCtl.

Referenced by CheckRequiredParameterValues().

RemovePromoteSignalFiles()

void RemovePromoteSignalFiles

(

void

)

Definition at line 4398 of file xlogrecovery.c.

{
    unlink(PROMOTE_SIGNAL_FILE);
}

References PROMOTE_SIGNAL_FILE.

Referenced by CheckForStandbyTrigger(), and PostmasterMain().

SetRecoveryPause()

void SetRecoveryPause

(

bool

recoveryPause

)

Definition at line 3034 of file xlogrecovery.c.

{
    SpinLockAcquire(&XLogRecoveryCtl->info_lck);
 
    if (!recoveryPause)
        XLogRecoveryCtl->recoveryPauseState = RECOVERY_NOT_PAUSED;
    else if (XLogRecoveryCtl->recoveryPauseState == RECOVERY_NOT_PAUSED)
        XLogRecoveryCtl->recoveryPauseState = RECOVERY_PAUSE_REQUESTED;
 
    SpinLockRelease(&XLogRecoveryCtl->info_lck);
 
    if (!recoveryPause)
        ConditionVariableBroadcast(&XLogRecoveryCtl->recoveryNotPausedCV);
}

References ConditionVariableBroadcast(), XLogRecoveryCtlData::info_lck, RECOVERY_NOT_PAUSED, RECOVERY_PAUSE_REQUESTED, XLogRecoveryCtlData::recoveryNotPausedCV, XLogRecoveryCtlData::recoveryPauseState, SpinLockAcquire, SpinLockRelease, and XLogRecoveryCtl.

Referenced by PerformWalRecovery(), pg_wal_replay_pause(), pg_wal_replay_resume(), RecoveryRequiresIntParameter(), and SetPromoteIsTriggered().

ShutdownWalRecovery()

void ShutdownWalRecovery

(

void

)

Definition at line 1558 of file xlogrecovery.c.

{
    char        recoveryPath[MAXPGPATH];
 
    /* Final update of pg_stat_recovery_prefetch. */
    XLogPrefetcherComputeStats(xlogprefetcher);
 
    /* Shut down xlogreader */
    if (readFile >= 0)
    {
        close(readFile);
        readFile = -1;
    }
    XLogReaderFree(xlogreader);
    XLogPrefetcherFree(xlogprefetcher);
 
    if (ArchiveRecoveryRequested)
    {
        /*
         * Since there might be a partial WAL segment named RECOVERYXLOG, get
         * rid of it.
         */
        snprintf(recoveryPath, MAXPGPATH, XLOGDIR "/RECOVERYXLOG");
        unlink(recoveryPath);   /* ignore any error */
 
        /* Get rid of any remaining recovered timeline-history file, too */
        snprintf(recoveryPath, MAXPGPATH, XLOGDIR "/RECOVERYHISTORY");
        unlink(recoveryPath);   /* ignore any error */
    }
 
    /*
     * We don't need the latch anymore. It's not strictly necessary to disown
     * it, but let's do it for the sake of tidiness.
     */
    if (ArchiveRecoveryRequested)
        DisownLatch(&XLogRecoveryCtl->recoveryWakeupLatch);
}

References ArchiveRecoveryRequested, close, DisownLatch(), MAXPGPATH, readFile, XLogRecoveryCtlData::recoveryWakeupLatch, snprintf, XLOGDIR, xlogprefetcher, XLogPrefetcherComputeStats(), XLogPrefetcherFree(), xlogreader, XLogReaderFree(), and XLogRecoveryCtl.

Referenced by StartupXLOG().

StartupRequestWalReceiverRestart()

void StartupRequestWalReceiverRestart

(

void

)

Definition at line 4319 of file xlogrecovery.c.

{
    if (currentSource == XLOG_FROM_STREAM && WalRcvRunning())
    {
        ereport(LOG,
                (errmsg("WAL receiver process shutdown requested")));
 
        pendingWalRcvRestart = true;
    }
}

References currentSource, ereport, errmsg(), LOG, pendingWalRcvRestart, WalRcvRunning(), and XLOG_FROM_STREAM.

Referenced by StartupRereadConfig().

WakeupRecovery()

void WakeupRecovery

(

void

)

Definition at line 4422 of file xlogrecovery.c.

{
    SetLatch(&XLogRecoveryCtl->recoveryWakeupLatch);
}

References XLogRecoveryCtlData::recoveryWakeupLatch, SetLatch(), and XLogRecoveryCtl.

Referenced by pg_wal_replay_pause(), StartupProcShutdownHandler(), StartupProcSigHupHandler(), StartupProcTriggerHandler(), WalRcvDie(), WalRcvWaitForStartPosition(), and XLogWalRcvFlush().

xlog_outdesc()

void xlog_outdesc	(	StringInfo	buf,
		XLogReaderState *	record
	)

Definition at line 2241 of file xlogrecovery.c.

{
    RmgrData    rmgr = GetRmgr(XLogRecGetRmid(record));
    uint8       info = XLogRecGetInfo(record);
    const char *id;
 
    appendStringInfoString(buf, rmgr.rm_name);
    appendStringInfoChar(buf, '/');
 
    id = rmgr.rm_identify(info);
    if (id == NULL)
        appendStringInfo(buf, "UNKNOWN (%X): ", info & ~XLR_INFO_MASK);
    else
        appendStringInfo(buf, "%s: ", id);
 
    rmgr.rm_desc(buf, record);
}

References appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), buf, GetRmgr(), RmgrData::rm_desc, RmgrData::rm_identify, RmgrData::rm_name, XLogRecGetInfo, XLogRecGetRmid, and XLR_INFO_MASK.

Referenced by PerformWalRecovery(), rm_redo_error_callback(), and XLogInsertRecord().

XLogRecoveryShmemInit()

void XLogRecoveryShmemInit

(

void

)

Definition at line 458 of file xlogrecovery.c.

{
    bool        found;
 
    XLogRecoveryCtl = (XLogRecoveryCtlData *)
        ShmemInitStruct("XLOG Recovery Ctl", XLogRecoveryShmemSize(), &found);
    if (found)
        return;
    memset(XLogRecoveryCtl, 0, sizeof(XLogRecoveryCtlData));
 
    SpinLockInit(&XLogRecoveryCtl->info_lck);
    InitSharedLatch(&XLogRecoveryCtl->recoveryWakeupLatch);
    ConditionVariableInit(&XLogRecoveryCtl->recoveryNotPausedCV);
}

References ConditionVariableInit(), XLogRecoveryCtlData::info_lck, InitSharedLatch(), XLogRecoveryCtlData::recoveryNotPausedCV, XLogRecoveryCtlData::recoveryWakeupLatch, ShmemInitStruct(), SpinLockInit, XLogRecoveryCtl, and XLogRecoveryShmemSize().

Referenced by CreateSharedMemoryAndSemaphores().

XLogRecoveryShmemSize()

Size XLogRecoveryShmemSize

(

void

)

Definition at line 447 of file xlogrecovery.c.

{
    Size        size;
 
    /* XLogRecoveryCtl */
    size = sizeof(XLogRecoveryCtlData);
 
    return size;
}

Referenced by CalculateShmemSize(), and XLogRecoveryShmemInit().

XLogRequestWalReceiverReply()

void XLogRequestWalReceiverReply

(

void

)

Definition at line 4431 of file xlogrecovery.c.

{
    doRequestWalReceiverReply = true;
}

References doRequestWalReceiverReply.

Referenced by xact_redo_commit().

Variable Documentation

archiveCleanupCommand

PGDLLIMPORT char* archiveCleanupCommand

extern

Definition at line 84 of file xlogrecovery.c.

Referenced by CreateRestartPoint().

PrimaryConnInfo

PGDLLIMPORT char* PrimaryConnInfo

extern

Definition at line 96 of file xlogrecovery.c.

Referenced by StartupRereadConfig(), validateRecoveryParameters(), and WaitForWALToBecomeAvailable().

PrimarySlotName

PGDLLIMPORT char* PrimarySlotName

extern

Definition at line 97 of file xlogrecovery.c.

Referenced by StartupRereadConfig(), and WaitForWALToBecomeAvailable().

reachedConsistency

PGDLLIMPORT bool reachedConsistency

extern

Definition at line 294 of file xlogrecovery.c.

Referenced by CheckRecoveryConsistency(), log_invalid_page(), PerformWalRecovery(), PrepareRedoAdd(), recovery_create_dbdir(), recoveryApplyDelay(), recoveryStopsAfter(), and recoveryStopsBefore().

recovery_min_apply_delay

PGDLLIMPORT int recovery_min_apply_delay

extern

Definition at line 93 of file xlogrecovery.c.

Referenced by recoveryApplyDelay().

recovery_target_time_string

PGDLLIMPORT char* recovery_target_time_string

extern

Definition at line 89 of file xlogrecovery.c.

Referenced by validateRecoveryParameters().

recoveryEndCommand

PGDLLIMPORT char* recoveryEndCommand

extern

Definition at line 83 of file xlogrecovery.c.

Referenced by CleanupAfterArchiveRecovery().

recoveryRestoreCommand

PGDLLIMPORT char* recoveryRestoreCommand

extern

Definition at line 82 of file xlogrecovery.c.

Referenced by RestoreArchivedFile(), and validateRecoveryParameters().

recoveryTarget

PGDLLIMPORT RecoveryTargetType recoveryTarget

extern

Definition at line 85 of file xlogrecovery.c.

Referenced by assign_recovery_target(), assign_recovery_target_lsn(), assign_recovery_target_name(), assign_recovery_target_time(), assign_recovery_target_xid(), getRecoveryStopReason(), InitWalRecovery(), PerformWalRecovery(), recoveryStopsAfter(), recoveryStopsBefore(), and validateRecoveryParameters().

recoveryTargetAction

PGDLLIMPORT int recoveryTargetAction

extern

Definition at line 87 of file xlogrecovery.c.

Referenced by PerformWalRecovery(), and validateRecoveryParameters().

recoveryTargetInclusive

PGDLLIMPORT bool recoveryTargetInclusive

extern

Definition at line 86 of file xlogrecovery.c.

Referenced by recoveryStopsAfter(), and recoveryStopsBefore().

recoveryTargetLSN

PGDLLIMPORT XLogRecPtr recoveryTargetLSN

extern

Definition at line 92 of file xlogrecovery.c.

Referenced by assign_recovery_target_lsn(), InitWalRecovery(), recoveryStopsAfter(), and recoveryStopsBefore().

recoveryTargetName

PGDLLIMPORT const char* recoveryTargetName

extern

Definition at line 91 of file xlogrecovery.c.

Referenced by assign_recovery_target_name(), InitWalRecovery(), and recoveryStopsAfter().

recoveryTargetTime

PGDLLIMPORT TimestampTz recoveryTargetTime

extern

Definition at line 90 of file xlogrecovery.c.

Referenced by InitWalRecovery(), recoveryStopsBefore(), and validateRecoveryParameters().

recoveryTargetTimeLineGoal

PGDLLIMPORT RecoveryTargetTimeLineGoal recoveryTargetTimeLineGoal

extern

Definition at line 120 of file xlogrecovery.c.

Referenced by assign_recovery_target_timeline(), validateRecoveryParameters(), and WaitForWALToBecomeAvailable().

recoveryTargetTLI

PGDLLIMPORT TimeLineID recoveryTargetTLI

extern

Definition at line 122 of file xlogrecovery.c.

Referenced by InitWalRecovery(), rescanLatestTimeLine(), StartupXLOG(), validateRecoveryParameters(), WaitForWALToBecomeAvailable(), and XLogFileReadAnyTLI().

recoveryTargetTLIRequested

PGDLLIMPORT TimeLineID recoveryTargetTLIRequested

extern

Definition at line 121 of file xlogrecovery.c.

Referenced by assign_recovery_target_timeline(), and validateRecoveryParameters().

recoveryTargetXid

PGDLLIMPORT TransactionId recoveryTargetXid

extern

Definition at line 88 of file xlogrecovery.c.

Referenced by assign_recovery_target_xid(), InitWalRecovery(), recoveryStopsAfter(), and recoveryStopsBefore().

StandbyMode

PGDLLIMPORT bool StandbyMode

extern

Definition at line 147 of file xlogrecovery.c.

Referenced by EnableStandbyMode(), FinishWalRecovery(), PerformWalRecovery(), ReadRecord(), RestoreArchivedFile(), WaitForWALToBecomeAvailable(), and XLogPageRead().

wal_receiver_create_temp_slot

PGDLLIMPORT bool wal_receiver_create_temp_slot

extern

Definition at line 98 of file xlogrecovery.c.

Referenced by StartupRereadConfig(), and WaitForWALToBecomeAvailable().