1. Andrew Dunstan
  2. pgdevel

Commits

Simon Riggs  committed 6265661

Avoid holding vmbuffer pin after VACUUM.
During VACUUM if we pause to perform a cycle
of index cleanup we drop the vmbuffer pin,
so we should do the same thing when heap
scan completes. This avoids holding vmbuffer
pin across the main index cleanup in VACUUM,
which could be minutes or hours longer than
necessary for correctness.

Bug report and suggested fix from Pavan Deolasee

  • Participants
  • Parent commits bdd5d41
  • Branches jsonapi

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Files changed (1)

File src/backend/commands/vacuumlazy.c

View file
 												  vacrelstats->scanned_pages,
 														 num_tuples);
 
+	/*
+	 * Release any remaining pin on visibility map page.
+	 */
+	if (BufferIsValid(vmbuffer))
+	{
+		ReleaseBuffer(vmbuffer);
+		vmbuffer = InvalidBuffer;
+	}
+
 	/* If any tuples need to be deleted, perform final vacuum cycle */
 	/* XXX put a threshold on min number of tuples here? */
 	if (vacrelstats->num_dead_tuples > 0)
 		vacrelstats->num_index_scans++;
 	}
 
-	/* Release the pin on the visibility map page */
-	if (BufferIsValid(vmbuffer))
-	{
-		ReleaseBuffer(vmbuffer);
-		vmbuffer = InvalidBuffer;
-	}
-
 	/* Do post-vacuum cleanup and statistics update for each index */
 	for (i = 0; i < nindexes; i++)
 		lazy_cleanup_index(Irel[i], indstats[i], vacrelstats);