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Avoid having autovacuum workers wait for relation locks.

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Waiting for relation locks can lead to starvation - it pins down an
autovacuum worker for as long as the lock is held.  But if we're doing
an anti-wraparound vacuum, then we still wait; maintenance can no longer
be put off.

To assist with troubleshooting, if log_autovacuum_min_duration >= 0,
we log whenever an autovacuum or autoanalyze is skipped for this reason.

Per a gripe by Josh Berkus, and ensuing discussion.
This commit is contained in:
Robert Haas
2011-02-07 22:04:29 -05:00
parent 47082fa875
commit 32896c40ca
5 changed files with 61 additions and 15 deletions
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3
src/include/nodes/parsenodes.h
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@@ -2332,7 +2332,8 @@ typedef enum VacuumOption
VACOPT_ANALYZE = 1 << 1, /* do ANALYZE */
VACOPT_VERBOSE = 1 << 2, /* print progress info */
VACOPT_FREEZE = 1 << 3, /* FREEZE option */
VACOPT_FULL = 1 << 4 /* FULL (non-concurrent) vacuum */
VACOPT_FULL = 1 << 4, /* FULL (non-concurrent) vacuum */
VACOPT_NOWAIT = 1 << 5
} VacuumOption;
typedef struct VacuumStmt