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Commit5a30d43

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Fix ordering issue with WAL operations in GIN fast insert path
Contrary to what is documented in src/backend/access/transam/README,ginHeapTupleFastInsert() had a few ordering issues with the way it doesits WAL operations when inserting items in its fast path.First, when using a separate list, XLogBeginInsert() was being alwayscalled before START_CRIT_SECTION(), and in this case a second thing waswrong when merging lists, as an exclusive lock was taken on the tailpage *before* calling XLogBeginInsert(). Finally, when inserting itemsinto a tail page, the order of XLogBeginInsert() andSTART_CRIT_SECTION() was reversed. This commit addresses all theseissues by moving the calls of XLogBeginInsert() after all the pageslogged are locked and pinned, within a critical section.This has been applied first only on HEAD as of56b6625, but as perdiscussion with Tom Lane and Álvaro Herrera, a backpatch is preferred tokeep all the branches consistent and to respect the transam's READMEwhere we can.Author: Matthias van de Meent, Zhang MingliDiscussion:https://postgr.es/m/CAEze2WhL8uLMqynnnCu1LAPwxD5RKEo0nHV+eXGg_N6ELU88HQ@mail.gmail.comBackpatch-through: 10
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‎src/backend/access/gin/ginfast.c

Lines changed: 8 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -285,9 +285,6 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
285285
memset(&sublist,0,sizeof(GinMetaPageData));
286286
makeSublist(index,collector->tuples,collector->ntuples,&sublist);
287287

288-
if (needWal)
289-
XLogBeginInsert();
290-
291288
/*
292289
* metapage was unlocked, see above
293290
*/
@@ -307,6 +304,9 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
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308305
metadata->nPendingPages=sublist.nPendingPages;
309306
metadata->nPendingHeapTuples=sublist.nPendingHeapTuples;
307+
308+
if (needWal)
309+
XLogBeginInsert();
310310
}
311311
else
312312
{
@@ -335,7 +335,10 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
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metadata->nPendingHeapTuples+=sublist.nPendingHeapTuples;
336336

337337
if (needWal)
338+
{
339+
XLogBeginInsert();
338340
XLogRegisterBuffer(1,buffer,REGBUF_STANDARD);
341+
}
339342
}
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}
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else
@@ -361,11 +364,11 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
361364

362365
data.ntuples=collector->ntuples;
363366

367+
START_CRIT_SECTION();
368+
364369
if (needWal)
365370
XLogBeginInsert();
366371

367-
START_CRIT_SECTION();
368-
369372
/*
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* Increase counter of heap tuples
371374
*/

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