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| author | Simon Riggs <simon@2ndQuadrant.com> | 2011-02-16 19:29:37 +0000 |
|---|---|---|
| committer | Simon Riggs <simon@2ndQuadrant.com> | 2011-02-16 19:29:37 +0000 |
| commit | bca8b7f16a3e720794cb0afbdb3733be4f8d9c2c (patch) | |
| tree | 4d2e650f058ffa99af77f9068bf64a223de17246 /src/include/access/xlog.h | |
| parent | 65076269ea54a8cd6e39f066a208c7d13aceac0a (diff) | |
| download | postgresql-bca8b7f16a3e720794cb0afbdb3733be4f8d9c2c.tar.gz postgresql-bca8b7f16a3e720794cb0afbdb3733be4f8d9c2c.zip | |
Hot Standby feedback for avoidance of cleanup conflicts on standby.
Standby optionally sends back information about oldestXmin of queries
which is then checked and applied to the WALSender's proc->xmin.
GetOldestXmin() is modified slightly to agree with GetSnapshotData(),
so that all backends on primary include WALSender within their snapshots.
Note this does nothing to change the snapshot xmin on either master or
standby. Feedback piggybacks on the standby reply message.
vacuum_defer_cleanup_age is no longer used on standby, though parameter
still exists on primary, since some use cases still exist.
Simon Riggs, review comments from Fujii Masao, Heikki Linnakangas, Robert Haas
Diffstat (limited to 'src/include/access/xlog.h')
| -rw-r--r-- | src/include/access/xlog.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/access/xlog.h b/src/include/access/xlog.h index 7cd07a25d22..7e9bad6e3a4 100644 --- a/src/include/access/xlog.h +++ b/src/include/access/xlog.h @@ -289,6 +289,7 @@ extern void xlog_desc(StringInfo buf, uint8 xl_info, char *rec); extern void issue_xlog_fsync(int fd, uint32 log, uint32 seg); extern bool RecoveryInProgress(void); +extern bool HotStandbyActive(void); extern bool XLogInsertAllowed(void); extern void GetXLogReceiptTime(TimestampTz *rtime, bool *fromStream); extern XLogRecPtr GetXLogReplayRecPtr(void); |