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Commit781ec6b

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Further reductions in Hot Standby conflict processing. These
come from the realistion that HEAP2_CLEAN records don'talways remove user visible data, so conflict processing forthem can be skipped. Confirm validity using Assert checks,clarify circumstances under which we log heap_cleanup_inforecords. Tuning arises from bug fixing of earlier safetycheck failures.
1 parent95a777c commit781ec6b

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3 files changed

+14
-11
lines changed

3 files changed

+14
-11
lines changed

‎src/backend/access/heap/heapam.c

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.288 2010/02/26 02:00:33 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/heap/heapam.c,v 1.289 2010/04/22 02:15:45 sriggs Exp $
1212
*
1313
*
1414
* INTERFACE ROUTINES
@@ -4106,7 +4106,7 @@ heap_xlog_cleanup_info(XLogRecPtr lsn, XLogRecord *record)
41064106
}
41074107

41084108
/*
4109-
* HandlesHEAP_CLEAN record type
4109+
* HandlesHEAP2_CLEAN record type
41104110
*/
41114111
staticvoid
41124112
heap_xlog_clean(XLogRecPtrlsn,XLogRecord*record)
@@ -4126,8 +4126,12 @@ heap_xlog_clean(XLogRecPtr lsn, XLogRecord *record)
41264126
/*
41274127
* We're about to remove tuples. In Hot Standby mode, ensure that there's
41284128
* no queries running for which the removed tuples are still visible.
4129+
*
4130+
* Not all HEAP2_CLEAN records remove tuples with xids, so we only want
4131+
* to conflict on the records that cause MVCC failures for user queries.
4132+
* If latestRemovedXid is invalid, skip conflict processing.
41294133
*/
4130-
if (InHotStandby)
4134+
if (InHotStandby&&TransactionIdIsValid(xlrec->latestRemovedXid))
41314135
ResolveRecoveryConflictWithSnapshot(xlrec->latestRemovedXid,
41324136
xlrec->node);
41334137

‎src/backend/access/heap/pruneheap.c

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/access/heap/pruneheap.c,v 1.23 2010/04/21 17:20:56 sriggs Exp $
11+
* $PostgreSQL: pgsql/src/backend/access/heap/pruneheap.c,v 1.24 2010/04/22 02:15:45 sriggs Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -236,6 +236,7 @@ heap_page_prune(Relation relation, Buffer buffer, TransactionId OldestXmin,
236236
{
237237
XLogRecPtrrecptr;
238238

239+
Assert(TransactionIdIsValid(prstate.latestRemovedXid));
239240
recptr=log_heap_clean(relation,buffer,
240241
prstate.redirected,prstate.nredirected,
241242
prstate.nowdead,prstate.ndead,

‎src/backend/commands/vacuumlazy.c

Lines changed: 5 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -29,7 +29,7 @@
2929
*
3030
*
3131
* IDENTIFICATION
32-
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.134 2010/04/21 19:53:24 sriggs Exp $
32+
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.135 2010/04/22 02:15:45 sriggs Exp $
3333
*
3434
*-------------------------------------------------------------------------
3535
*/
@@ -274,12 +274,11 @@ vacuum_log_cleanup_info(Relation rel, LVRelStats *vacrelstats)
274274
if (rel->rd_istemp|| !XLogIsNeeded())
275275
return;
276276

277-
if (vacrelstats->tuples_deleted>0)
278-
{
279-
Assert(TransactionIdIsValid(vacrelstats->latestRemovedXid));
280-
277+
/*
278+
* No need to write the record at all unless it contains a valid value
279+
*/
280+
if (TransactionIdIsValid(vacrelstats->latestRemovedXid))
281281
(void)log_heap_cleanup_info(rel->rd_node,vacrelstats->latestRemovedXid);
282-
}
283282
}
284283

285284
/*
@@ -687,7 +686,6 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
687686
* Forget the now-vacuumed tuples, and press on, but be careful
688687
* not to reset latestRemovedXid since we want that value to be valid.
689688
*/
690-
Assert(TransactionIdIsValid(vacrelstats->latestRemovedXid));
691689
vacrelstats->num_dead_tuples=0;
692690
vacuumed_pages++;
693691
}

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