Fix broken cleanup interlock for GIN pending list.

The pending list must (for correctness) always be cleaned up by vacuum, and
should (for the avoidance of surprising behavior) always be cleaned up
by an explicit call to gin_clean_pending_list, but cleanup is optional
when inserting.  The old logic got this backward: cleanup was forced
if (stats == NULL), but that's going to be *false* when vacuuming and
*true* for inserts.

Masahiko Sawada, reviewed by me.

Discussion: http://postgr.es/m/CAD21AoBLUSyiYKnTYtSAbC+F=XDjiaBrOUEGK+zUXdQ8owfPKw@mail.gmail.com

diff --git a/src/backend/access/gin/ginfast.c b/src/backend/access/gin/ginfast.c
index 59e435465acba6883f71d3124a889c7be5949cab..ff610ef218439c8e03dbdf3ab720cc62881cf6f7 100644 (file)
--- a/src/backend/access/gin/ginfast.c
+++ b/src/backend/access/gin/ginfast.c
@@ -440,8 +440,12 @@ ginHeapTupleFastInsert(GinState *ginstate, GinTupleCollector *collector)
 
        END_CRIT_SECTION();
 
+       /*
+        * Since it could contend with concurrent cleanup process we cleanup
+        * pending list not forcibly.
+        */
        if (needCleanup)
-               ginInsertCleanup(ginstate, false, true, NULL);
+               ginInsertCleanup(ginstate, false, true, false, NULL);
 }
 
 /*
@@ -727,7 +731,8 @@ processPendingPage(BuildAccumulator *accum, KeyArray *ka,
  */
 void
 ginInsertCleanup(GinState *ginstate, bool full_clean,
-                                bool fill_fsm, IndexBulkDeleteResult *stats)
+                                bool fill_fsm, bool forceCleanup,
+                                IndexBulkDeleteResult *stats)
 {
        Relation        index = ginstate->index;
        Buffer          metabuffer,
@@ -744,7 +749,6 @@ ginInsertCleanup(GinState *ginstate, bool full_clean,
        bool            cleanupFinish = false;
        bool            fsm_vac = false;
        Size            workMemory;
-       bool            inVacuum = (stats == NULL);
 
        /*
         * We would like to prevent concurrent cleanup process. For that we will
@@ -753,7 +757,7 @@ ginInsertCleanup(GinState *ginstate, bool full_clean,
         * insertion into pending list
         */
 
-       if (inVacuum)
+       if (forceCleanup)
        {
                /*
                 * We are called from [auto]vacuum/analyze or gin_clean_pending_list()
@@ -1016,7 +1020,7 @@ gin_clean_pending_list(PG_FUNCTION_ARGS)
 
        memset(&stats, 0, sizeof(stats));
        initGinState(&ginstate, indexRel);
-       ginInsertCleanup(&ginstate, true, true, &stats);
+       ginInsertCleanup(&ginstate, true, true, true, &stats);
 
        index_close(indexRel, AccessShareLock);
 

diff --git a/src/backend/access/gin/ginvacuum.c b/src/backend/access/gin/ginvacuum.c
index 31425e9963e583c789d442897ceab03510bddba5..d3e4a1776701dc7998aa22672ebd2570e8ac3bc8 100644 (file)
--- a/src/backend/access/gin/ginvacuum.c
+++ b/src/backend/access/gin/ginvacuum.c
@@ -570,7 +570,7 @@ ginbulkdelete(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
                 * and cleanup any pending inserts
                 */
                ginInsertCleanup(&gvs.ginstate, !IsAutoVacuumWorkerProcess(),
-                                                false, stats);
+                                                false, true, stats);
        }
 
        /* we'll re-count the tuples each time */
@@ -683,7 +683,7 @@ ginvacuumcleanup(IndexVacuumInfo *info, IndexBulkDeleteResult *stats)
                if (IsAutoVacuumWorkerProcess())
                {
                        initGinState(&ginstate, index);
-                       ginInsertCleanup(&ginstate, false, true, stats);
+                       ginInsertCleanup(&ginstate, false, true, true, stats);
                }
                return stats;
        }
@@ -697,7 +697,7 @@ ginvacuumcleanup(IndexVacuumInfo *info, IndexBulkDeleteResult *stats)
                stats = (IndexBulkDeleteResult *) palloc0(sizeof(IndexBulkDeleteResult));
                initGinState(&ginstate, index);
                ginInsertCleanup(&ginstate, !IsAutoVacuumWorkerProcess(),
-                                                false, stats);
+                                                false, true, stats);
        }
 
        memset(&idxStat, 0, sizeof(idxStat));

diff --git a/src/include/access/gin_private.h b/src/include/access/gin_private.h
index adfdb0c6d9c2517e5e4a324b604808526c631382..f57ba5594c2265f10a55f1019ecff51979796675 100644 (file)
--- a/src/include/access/gin_private.h
+++ b/src/include/access/gin_private.h
@@ -439,7 +439,7 @@ extern void ginHeapTupleFastCollect(GinState *ginstate,
                                                OffsetNumber attnum, Datum value, bool isNull,
                                                ItemPointer ht_ctid);
 extern void ginInsertCleanup(GinState *ginstate, bool full_clean,
-                                bool fill_fsm, IndexBulkDeleteResult *stats);
+                                bool fill_fsm, bool forceCleanup, IndexBulkDeleteResult *stats);
 
 /* ginpostinglist.c */