TimeLineID prevTLI, TimeLineID replayTLI);
static void VerifyOverwriteContrecord(xl_overwrite_contrecord *xlrec,
XLogReaderState *state);
-static int LocalSetXLogInsertAllowed(void);
+static int LocalSetXLogInsertAllowed(void);
static void CreateEndOfRecoveryRecord(void);
static XLogRecPtr CreateOverwriteContrecordRecord(XLogRecPtr aborted_lsn);
static void CheckPointGuts(XLogRecPtr checkPointRedo, int flags);
* We switched to a new timeline. Clean up segments on the old timeline.
*
* If there are any higher-numbered segments on the old timeline, remove
- * them. They might contain valid WAL, but they might also be pre-allocated
- * files containing garbage. In any case, they are not part of the new
- * timeline's history so we don't need them.
+ * them. They might contain valid WAL, but they might also be
+ * pre-allocated files containing garbage. In any case, they are not part
+ * of the new timeline's history so we don't need them.
*/
RemoveNonParentXlogFiles(EndOfLog, newTLI);
/*
* If the switch happened in the middle of a segment, what to do with the
* last, partial segment on the old timeline? If we don't archive it, and
- * the server that created the WAL never archives it either (e.g. because it
- * was hit by a meteor), it will never make it to the archive. That's OK
- * from our point of view, because the new segment that we created with the
- * new TLI contains all the WAL from the old timeline up to the switch
+ * the server that created the WAL never archives it either (e.g. because
+ * it was hit by a meteor), it will never make it to the archive. That's
+ * OK from our point of view, because the new segment that we created with
+ * the new TLI contains all the WAL from the old timeline up to the switch
* point. But if you later try to do PITR to the "missing" WAL on the old
- * timeline, recovery won't find it in the archive. It's physically present
- * in the new file with new TLI, but recovery won't look there when it's
- * recovering to the older timeline. On the other hand, if we archive the
- * partial segment, and the original server on that timeline is still
- * running and archives the completed version of the same segment later, it
- * will fail. (We used to do that in 9.4 and below, and it caused such
- * problems).
+ * timeline, recovery won't find it in the archive. It's physically
+ * present in the new file with new TLI, but recovery won't look there
+ * when it's recovering to the older timeline. On the other hand, if we
+ * archive the partial segment, and the original server on that timeline
+ * is still running and archives the completed version of the same segment
+ * later, it will fail. (We used to do that in 9.4 and below, and it
+ * caused such problems).
*
- * As a compromise, we rename the last segment with the .partial suffix, and
- * archive it. Archive recovery will never try to read .partial segments, so
- * they will normally go unused. But in the odd PITR case, the administrator
- * can copy them manually to the pg_wal directory (removing the suffix).
- * They can be useful in debugging, too.
+ * As a compromise, we rename the last segment with the .partial suffix,
+ * and archive it. Archive recovery will never try to read .partial
+ * segments, so they will normally go unused. But in the odd PITR case,
+ * the administrator can copy them manually to the pg_wal directory
+ * (removing the suffix). They can be useful in debugging, too.
*
* If a .done or .ready file already exists for the old timeline, however,
- * we had already determined that the segment is complete, so we can let it
- * be archived normally. (In particular, if it was restored from the archive
- * to begin with, it's expected to have a .done file).
+ * we had already determined that the segment is complete, so we can let
+ * it be archived normally. (In particular, if it was restored from the
+ * archive to begin with, it's expected to have a .done file).
*/
if (XLogSegmentOffset(EndOfLog, wal_segment_size) != 0 &&
XLogArchivingActive())
* Before replaying this record, check if this record causes
* the current timeline to change. The record is already
* considered to be part of the new timeline, so we update
- * replayTLI before replaying it. That's important so
- * that replayEndTLI, which is recorded as the minimum
- * recovery point's TLI if recovery stops after this record,
- * is set correctly.
+ * replayTLI before replaying it. That's important so that
+ * replayEndTLI, which is recorded as the minimum recovery
+ * point's TLI if recovery stops after this record, is set
+ * correctly.
*/
if (record->xl_rmid == RM_XLOG_ID)
{
* Emit checkpoint or end-of-recovery record in XLOG, if required.
*
* XLogCtl->lastReplayedEndRecPtr will be a valid LSN if and only if we
- * entered recovery. Even if we ultimately replayed no WAL records, it will
- * have been initialized based on where replay was due to start. We don't
- * need a lock to access this, since this can't change any more by the time
- * we reach this code.
+ * entered recovery. Even if we ultimately replayed no WAL records, it
+ * will have been initialized based on where replay was due to start. We
+ * don't need a lock to access this, since this can't change any more by
+ * the time we reach this code.
*/
if (!XLogRecPtrIsInvalid(XLogCtl->lastReplayedEndRecPtr))
promoted = PerformRecoveryXLogAction();
/*
* Perform a checkpoint to update all our recovery activity to disk.
*
- * Note that we write a shutdown checkpoint rather than an on-line one. This
- * is not particularly critical, but since we may be assigning a new TLI,
- * using a shutdown checkpoint allows us to have the rule that TLI only
- * changes in shutdown checkpoints, which allows some extra error checking
- * in xlog_redo.
+ * Note that we write a shutdown checkpoint rather than an on-line one.
+ * This is not particularly critical, but since we may be assigning a new
+ * TLI, using a shutdown checkpoint allows us to have the rule that TLI
+ * only changes in shutdown checkpoints, which allows some extra error
+ * checking in xlog_redo.
*
- * In promotion, only create a lightweight end-of-recovery record instead of
- * a full checkpoint. A checkpoint is requested later, after we're fully out
- * of recovery mode and already accepting queries.
+ * In promotion, only create a lightweight end-of-recovery record instead
+ * of a full checkpoint. A checkpoint is requested later, after we're
+ * fully out of recovery mode and already accepting queries.
*/
if (ArchiveRecoveryRequested && IsUnderPostmaster &&
LocalPromoteIsTriggered)
/*
* Insert a special WAL record to mark the end of recovery, since we
* aren't doing a checkpoint. That means that the checkpointer process
- * may likely be in the middle of a time-smoothed restartpoint and could
- * continue to be for minutes after this. That sounds strange, but the
- * effect is roughly the same and it would be stranger to try to come
- * out of the restartpoint and then checkpoint. We request a checkpoint
- * later anyway, just for safety.
+ * may likely be in the middle of a time-smoothed restartpoint and
+ * could continue to be for minutes after this. That sounds strange,
+ * but the effect is roughly the same and it would be stranger to try
+ * to come out of the restartpoint and then checkpoint. We request a
+ * checkpoint later anyway, just for safety.
*/
CreateEndOfRecoveryRecord();
}
static int
LocalSetXLogInsertAllowed(void)
{
- int oldXLogAllowed = LocalXLogInsertAllowed;
+ int oldXLogAllowed = LocalXLogInsertAllowed;
LocalXLogInsertAllowed = 1;
SpinLockRelease(&XLogCtl->info_lck);
/*
- * If we're writing and flushing WAL, the time line can't be changing,
- * so no lock is required.
+ * If we're writing and flushing WAL, the time line can't be changing, so
+ * no lock is required.
*/
if (insertTLI)
*insertTLI = XLogCtl->InsertTimeLineID;
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