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Remove secondary checkpoint
Previously server reserved WAL for last two checkpoints, which used too much disk space for small servers. Bumps PG_CONTROL_VERSION Author: Simon Riggs <simon@2ndQuadrant.com> Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Simon Riggs
parent
98267ee83e
commit
4b0d28de06
@ -568,7 +568,7 @@ tar -cf backup.tar /usr/local/pgsql/data
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normally creates just a few segment files and then
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<quote>recycles</quote> them by renaming no-longer-needed segment files
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to higher segment numbers. It's assumed that segment files whose
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contents precede the checkpoint-before-last are no longer of
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contents precede the last checkpoint are no longer of
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interest and can be recycled.
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</para>
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@ -17948,11 +17948,6 @@ SELECT collation for ('foo' COLLATE "de_DE");
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<entry><type>pg_lsn</type></entry>
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</row>
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<row>
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<entry><literal>prior_lsn</literal></entry>
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<entry><type>pg_lsn</type></entry>
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</row>
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<row>
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<entry><literal>redo_lsn</literal></entry>
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<entry><type>pg_lsn</type></entry>
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@ -2221,13 +2221,18 @@ CalculateCheckpointSegments(void)
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* Calculate the distance at which to trigger a checkpoint, to avoid
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* exceeding max_wal_size_mb. This is based on two assumptions:
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*
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* a) we keep WAL for two checkpoint cycles, back to the "prev" checkpoint.
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* a) we keep WAL for only one checkpoint cycle (prior to PG11 we kept
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* WAL for two checkpoint cycles to allow us to recover from the
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* secondary checkpoint if the first checkpoint failed, though we
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* only did this on the master anyway, not on standby. Keeping just
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* one checkpoint simplifies processing and reduces disk space in
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* many smaller databases.)
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* b) during checkpoint, we consume checkpoint_completion_target *
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* number of segments consumed between checkpoints.
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*-------
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*/
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target = (double) ConvertToXSegs(max_wal_size_mb, wal_segment_size) /
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(2.0 + CheckPointCompletionTarget);
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(1.0 + CheckPointCompletionTarget);
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/* round down */
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CheckPointSegments = (int) target;
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@ -2279,23 +2284,8 @@ XLOGfileslop(XLogRecPtr PriorRedoPtr)
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* To estimate where the next checkpoint will finish, assume that the
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* system runs steadily consuming CheckPointDistanceEstimate bytes between
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* every checkpoint.
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*
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* The reason this calculation is done from the prior checkpoint, not the
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* one that just finished, is that this behaves better if some checkpoint
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* cycles are abnormally short, like if you perform a manual checkpoint
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* right after a timed one. The manual checkpoint will make almost a full
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* cycle's worth of WAL segments available for recycling, because the
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* segments from the prior's prior, fully-sized checkpoint cycle are no
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* longer needed. However, the next checkpoint will make only few segments
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* available for recycling, the ones generated between the timed
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* checkpoint and the manual one right after that. If at the manual
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* checkpoint we only retained enough segments to get us to the next timed
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* one, and removed the rest, then at the next checkpoint we would not
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* have enough segments around for recycling, to get us to the checkpoint
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* after that. Basing the calculations on the distance from the prior redo
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* pointer largely fixes that problem.
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*/
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distance = (2.0 + CheckPointCompletionTarget) * CheckPointDistanceEstimate;
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distance = (1.0 + CheckPointCompletionTarget) * CheckPointDistanceEstimate;
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/* add 10% for good measure. */
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distance *= 1.10;
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@ -6593,30 +6583,17 @@ StartupXLOG(void)
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(errmsg("checkpoint record is at %X/%X",
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(uint32) (checkPointLoc >> 32), (uint32) checkPointLoc)));
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}
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else if (StandbyMode)
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else
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{
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/*
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* The last valid checkpoint record required for a streaming
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* recovery exists in neither standby nor the primary.
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* We used to attempt to go back to a secondary checkpoint
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* record here, but only when not in standby_mode. We now
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* just fail if we can't read the last checkpoint because
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* this allows us to simplify processing around checkpoints.
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*/
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ereport(PANIC,
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(errmsg("could not locate a valid checkpoint record")));
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}
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else
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{
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checkPointLoc = ControlFile->prevCheckPoint;
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record = ReadCheckpointRecord(xlogreader, checkPointLoc, 2, true);
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if (record != NULL)
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{
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ereport(LOG,
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(errmsg("using previous checkpoint record at %X/%X",
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(uint32) (checkPointLoc >> 32), (uint32) checkPointLoc)));
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InRecovery = true; /* force recovery even if SHUTDOWNED */
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}
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else
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ereport(PANIC,
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(errmsg("could not locate a valid checkpoint record")));
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}
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memcpy(&checkPoint, XLogRecGetData(xlogreader), sizeof(CheckPoint));
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wasShutdown = ((record->xl_info & ~XLR_INFO_MASK) == XLOG_CHECKPOINT_SHUTDOWN);
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}
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@ -6845,7 +6822,6 @@ StartupXLOG(void)
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recoveryTargetTLI)));
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ControlFile->state = DB_IN_CRASH_RECOVERY;
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}
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ControlFile->prevCheckPoint = ControlFile->checkPoint;
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ControlFile->checkPoint = checkPointLoc;
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ControlFile->checkPointCopy = checkPoint;
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if (InArchiveRecovery)
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@ -7619,12 +7595,11 @@ StartupXLOG(void)
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{
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if (fast_promote)
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{
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checkPointLoc = ControlFile->prevCheckPoint;
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checkPointLoc = ControlFile->checkPoint;
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/*
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* Confirm the last checkpoint is available for us to recover
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* from if we fail. Note that we don't check for the secondary
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* checkpoint since that isn't available in most base backups.
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* from if we fail.
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*/
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record = ReadCheckpointRecord(xlogreader, checkPointLoc, 1, false);
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if (record != NULL)
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@ -8090,7 +8065,7 @@ LocalSetXLogInsertAllowed(void)
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* Subroutine to try to fetch and validate a prior checkpoint record.
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*
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* whichChkpt identifies the checkpoint (merely for reporting purposes).
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* 1 for "primary", 2 for "secondary", 0 for "other" (backup_label)
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* 1 for "primary", 0 for "other" (backup_label)
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*/
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static XLogRecord *
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ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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@ -8110,10 +8085,6 @@ ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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ereport(LOG,
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(errmsg("invalid primary checkpoint link in control file")));
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break;
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case 2:
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ereport(LOG,
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(errmsg("invalid secondary checkpoint link in control file")));
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break;
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default:
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ereport(LOG,
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(errmsg("invalid checkpoint link in backup_label file")));
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@ -8135,10 +8106,6 @@ ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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ereport(LOG,
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(errmsg("invalid primary checkpoint record")));
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break;
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case 2:
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ereport(LOG,
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(errmsg("invalid secondary checkpoint record")));
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break;
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default:
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ereport(LOG,
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(errmsg("invalid checkpoint record")));
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@ -8154,10 +8121,6 @@ ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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ereport(LOG,
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(errmsg("invalid resource manager ID in primary checkpoint record")));
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break;
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case 2:
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ereport(LOG,
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(errmsg("invalid resource manager ID in secondary checkpoint record")));
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break;
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default:
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ereport(LOG,
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(errmsg("invalid resource manager ID in checkpoint record")));
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@ -8175,10 +8138,6 @@ ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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ereport(LOG,
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(errmsg("invalid xl_info in primary checkpoint record")));
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break;
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case 2:
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ereport(LOG,
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(errmsg("invalid xl_info in secondary checkpoint record")));
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break;
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default:
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ereport(LOG,
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(errmsg("invalid xl_info in checkpoint record")));
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@ -8194,10 +8153,6 @@ ReadCheckpointRecord(XLogReaderState *xlogreader, XLogRecPtr RecPtr,
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ereport(LOG,
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(errmsg("invalid length of primary checkpoint record")));
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break;
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case 2:
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ereport(LOG,
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(errmsg("invalid length of secondary checkpoint record")));
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break;
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default:
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ereport(LOG,
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(errmsg("invalid length of checkpoint record")));
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@ -8933,8 +8888,7 @@ CreateCheckPoint(int flags)
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(errmsg("concurrent write-ahead log activity while database system is shutting down")));
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/*
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* Remember the prior checkpoint's redo pointer, used later to determine
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* the point where the log can be truncated.
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* Remember the prior checkpoint's redo ptr for UpdateCheckPointDistanceEstimate()
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*/
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PriorRedoPtr = ControlFile->checkPointCopy.redo;
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@ -8944,7 +8898,6 @@ CreateCheckPoint(int flags)
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LWLockAcquire(ControlFileLock, LW_EXCLUSIVE);
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if (shutdown)
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ControlFile->state = DB_SHUTDOWNED;
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ControlFile->prevCheckPoint = ControlFile->checkPoint;
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ControlFile->checkPoint = ProcLastRecPtr;
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ControlFile->checkPointCopy = checkPoint;
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ControlFile->time = (pg_time_t) time(NULL);
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@ -8982,8 +8935,7 @@ CreateCheckPoint(int flags)
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smgrpostckpt();
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/*
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* Delete old log files (those no longer needed even for previous
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* checkpoint or the standbys in XLOG streaming).
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* Delete old log files and recycle them
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*/
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if (PriorRedoPtr != InvalidXLogRecPtr)
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{
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@ -8992,7 +8944,8 @@ CreateCheckPoint(int flags)
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/* Update the average distance between checkpoints. */
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UpdateCheckPointDistanceEstimate(RedoRecPtr - PriorRedoPtr);
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XLByteToSeg(PriorRedoPtr, _logSegNo, wal_segment_size);
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/* Trim from the last checkpoint, not the last - 1 */
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XLByteToSeg(RedoRecPtr, _logSegNo, wal_segment_size);
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KeepLogSeg(recptr, &_logSegNo);
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_logSegNo--;
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RemoveOldXlogFiles(_logSegNo, PriorRedoPtr, recptr);
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@ -9258,8 +9211,7 @@ CreateRestartPoint(int flags)
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CheckPointGuts(lastCheckPoint.redo, flags);
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/*
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* Remember the prior checkpoint's redo pointer, used later to determine
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* the point at which we can truncate the log.
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* Remember the prior checkpoint's redo ptr for UpdateCheckPointDistanceEstimate()
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*/
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PriorRedoPtr = ControlFile->checkPointCopy.redo;
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@ -9273,7 +9225,6 @@ CreateRestartPoint(int flags)
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if (ControlFile->state == DB_IN_ARCHIVE_RECOVERY &&
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ControlFile->checkPointCopy.redo < lastCheckPoint.redo)
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{
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ControlFile->prevCheckPoint = ControlFile->checkPoint;
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ControlFile->checkPoint = lastCheckPointRecPtr;
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ControlFile->checkPointCopy = lastCheckPoint;
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ControlFile->time = (pg_time_t) time(NULL);
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@ -93,41 +93,39 @@ pg_control_checkpoint(PG_FUNCTION_ARGS)
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tupdesc = CreateTemplateTupleDesc(19, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "checkpoint_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "prior_lsn",
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "redo_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "redo_lsn",
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LSNOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "redo_wal_file",
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TupleDescInitEntry(tupdesc, (AttrNumber) 3, "redo_wal_file",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "timeline_id",
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TupleDescInitEntry(tupdesc, (AttrNumber) 4, "timeline_id",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "prev_timeline_id",
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TupleDescInitEntry(tupdesc, (AttrNumber) 5, "prev_timeline_id",
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INT4OID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "full_page_writes",
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TupleDescInitEntry(tupdesc, (AttrNumber) 6, "full_page_writes",
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BOOLOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "next_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 7, "next_xid",
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TEXTOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "next_oid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 8, "next_oid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "next_multixact_id",
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TupleDescInitEntry(tupdesc, (AttrNumber) 9, "next_multixact_id",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "next_multi_offset",
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TupleDescInitEntry(tupdesc, (AttrNumber) 10, "next_multi_offset",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 12, "oldest_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 11, "oldest_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 13, "oldest_xid_dbid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 12, "oldest_xid_dbid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 14, "oldest_active_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 13, "oldest_active_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 15, "oldest_multi_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 14, "oldest_multi_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 16, "oldest_multi_dbid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 15, "oldest_multi_dbid",
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OIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 17, "oldest_commit_ts_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 16, "oldest_commit_ts_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 18, "newest_commit_ts_xid",
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TupleDescInitEntry(tupdesc, (AttrNumber) 17, "newest_commit_ts_xid",
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XIDOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 19, "checkpoint_time",
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TupleDescInitEntry(tupdesc, (AttrNumber) 18, "checkpoint_time",
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TIMESTAMPTZOID, -1, 0);
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tupdesc = BlessTupleDesc(tupdesc);
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@ -149,62 +147,59 @@ pg_control_checkpoint(PG_FUNCTION_ARGS)
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values[0] = LSNGetDatum(ControlFile->checkPoint);
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nulls[0] = false;
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values[1] = LSNGetDatum(ControlFile->prevCheckPoint);
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values[1] = LSNGetDatum(ControlFile->checkPointCopy.redo);
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nulls[1] = false;
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values[2] = LSNGetDatum(ControlFile->checkPointCopy.redo);
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values[2] = CStringGetTextDatum(xlogfilename);
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nulls[2] = false;
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values[3] = CStringGetTextDatum(xlogfilename);
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values[3] = Int32GetDatum(ControlFile->checkPointCopy.ThisTimeLineID);
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nulls[3] = false;
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values[4] = Int32GetDatum(ControlFile->checkPointCopy.ThisTimeLineID);
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values[4] = Int32GetDatum(ControlFile->checkPointCopy.PrevTimeLineID);
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nulls[4] = false;
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values[5] = Int32GetDatum(ControlFile->checkPointCopy.PrevTimeLineID);
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values[5] = BoolGetDatum(ControlFile->checkPointCopy.fullPageWrites);
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nulls[5] = false;
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values[6] = BoolGetDatum(ControlFile->checkPointCopy.fullPageWrites);
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nulls[6] = false;
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values[7] = CStringGetTextDatum(psprintf("%u:%u",
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values[6] = CStringGetTextDatum(psprintf("%u:%u",
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ControlFile->checkPointCopy.nextXidEpoch,
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ControlFile->checkPointCopy.nextXid));
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nulls[6] = false;
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values[7] = ObjectIdGetDatum(ControlFile->checkPointCopy.nextOid);
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nulls[7] = false;
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values[8] = ObjectIdGetDatum(ControlFile->checkPointCopy.nextOid);
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values[8] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMulti);
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nulls[8] = false;
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values[9] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMulti);
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values[9] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMultiOffset);
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nulls[9] = false;
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values[10] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMultiOffset);
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values[10] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestXid);
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nulls[10] = false;
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values[11] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestXid);
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values[11] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestXidDB);
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nulls[11] = false;
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values[12] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestXidDB);
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values[12] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestActiveXid);
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nulls[12] = false;
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values[13] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestActiveXid);
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values[13] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestMulti);
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nulls[13] = false;
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values[14] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestMulti);
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values[14] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestMultiDB);
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nulls[14] = false;
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values[15] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestMultiDB);
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values[15] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestCommitTsXid);
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nulls[15] = false;
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values[16] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestCommitTsXid);
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values[16] = TransactionIdGetDatum(ControlFile->checkPointCopy.newestCommitTsXid);
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nulls[16] = false;
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values[17] = TransactionIdGetDatum(ControlFile->checkPointCopy.newestCommitTsXid);
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nulls[17] = false;
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values[18] = TimestampTzGetDatum(
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values[17] = TimestampTzGetDatum(
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time_t_to_timestamptz(ControlFile->checkPointCopy.time));
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nulls[18] = false;
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nulls[17] = false;
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htup = heap_form_tuple(tupdesc, values, nulls);
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@ -222,9 +222,6 @@ main(int argc, char *argv[])
|
||||
printf(_("Latest checkpoint location: %X/%X\n"),
|
||||
(uint32) (ControlFile->checkPoint >> 32),
|
||||
(uint32) ControlFile->checkPoint);
|
||||
printf(_("Prior checkpoint location: %X/%X\n"),
|
||||
(uint32) (ControlFile->prevCheckPoint >> 32),
|
||||
(uint32) ControlFile->prevCheckPoint);
|
||||
printf(_("Latest checkpoint's REDO location: %X/%X\n"),
|
||||
(uint32) (ControlFile->checkPointCopy.redo >> 32),
|
||||
(uint32) ControlFile->checkPointCopy.redo);
|
||||
|
||||
@ -876,7 +876,6 @@ RewriteControlFile(void)
|
||||
ControlFile.state = DB_SHUTDOWNED;
|
||||
ControlFile.time = (pg_time_t) time(NULL);
|
||||
ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
|
||||
ControlFile.prevCheckPoint = 0;
|
||||
ControlFile.minRecoveryPoint = 0;
|
||||
ControlFile.minRecoveryPointTLI = 0;
|
||||
ControlFile.backupStartPoint = 0;
|
||||
|
||||
@ -21,7 +21,7 @@
|
||||
|
||||
|
||||
/* Version identifier for this pg_control format */
|
||||
#define PG_CONTROL_VERSION 1003
|
||||
#define PG_CONTROL_VERSION 1100
|
||||
|
||||
/* Nonce key length, see below */
|
||||
#define MOCK_AUTH_NONCE_LEN 32
|
||||
@ -127,7 +127,6 @@ typedef struct ControlFileData
|
||||
DBState state; /* see enum above */
|
||||
pg_time_t time; /* time stamp of last pg_control update */
|
||||
XLogRecPtr checkPoint; /* last check point record ptr */
|
||||
XLogRecPtr prevCheckPoint; /* previous check point record ptr */
|
||||
|
||||
CheckPoint checkPointCopy; /* copy of last check point record */
|
||||
|
||||
|
||||
@ -5500,7 +5500,7 @@ DESCR("pg_config binary as a function");
|
||||
DATA(insert OID = 3441 ( pg_control_system PGNSP PGUID 12 1 0 0 0 f f f f t f v s 0 0 2249 "" "{23,23,20,1184}" "{o,o,o,o}" "{pg_control_version,catalog_version_no,system_identifier,pg_control_last_modified}" _null_ _null_ pg_control_system _null_ _null_ _null_ ));
|
||||
DESCR("pg_controldata general state information as a function");
|
||||
|
||||
DATA(insert OID = 3442 ( pg_control_checkpoint PGNSP PGUID 12 1 0 0 0 f f f f t f v s 0 0 2249 "" "{3220,3220,3220,25,23,23,16,25,26,28,28,28,26,28,28,26,28,28,1184}" "{o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}" "{checkpoint_lsn,prior_lsn,redo_lsn,redo_wal_file,timeline_id,prev_timeline_id,full_page_writes,next_xid,next_oid,next_multixact_id,next_multi_offset,oldest_xid,oldest_xid_dbid,oldest_active_xid,oldest_multi_xid,oldest_multi_dbid,oldest_commit_ts_xid,newest_commit_ts_xid,checkpoint_time}" _null_ _null_ pg_control_checkpoint _null_ _null_ _null_ ));
|
||||
DATA(insert OID = 3442 ( pg_control_checkpoint PGNSP PGUID 12 1 0 0 0 f f f f t f v s 0 0 2249 "" "{3220,3220,25,23,23,16,25,26,28,28,28,26,28,28,26,28,28,1184}" "{o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o,o}" "{checkpoint_lsn,redo_lsn,redo_wal_file,timeline_id,prev_timeline_id,full_page_writes,next_xid,next_oid,next_multixact_id,next_multi_offset,oldest_xid,oldest_xid_dbid,oldest_active_xid,oldest_multi_xid,oldest_multi_dbid,oldest_commit_ts_xid,newest_commit_ts_xid,checkpoint_time}" _null_ _null_ pg_control_checkpoint _null_ _null_ _null_ ));
|
||||
DESCR("pg_controldata checkpoint state information as a function");
|
||||
|
||||
DATA(insert OID = 3443 ( pg_control_recovery PGNSP PGUID 12 1 0 0 0 f f f f t f v s 0 0 2249 "" "{3220,23,3220,3220,16}" "{o,o,o,o,o}" "{min_recovery_end_lsn,min_recovery_end_timeline,backup_start_lsn,backup_end_lsn,end_of_backup_record_required}" _null_ _null_ pg_control_recovery _null_ _null_ _null_ ));
|
||||
|
||||
Loading…
Reference in New Issue
Block a user