From c3a79e71929a6b5cdd2416ab4976dab59736c937 Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Thu, 9 Jul 2020 20:13:25 -0400 Subject: [PATCH] Remove WARNING message from brin_desummarize_range This message was being emitted on the grounds that only crashed summarization could cause it, but in reality even an aborted vacuum could do it ... which makes it way too noisy, particularly since it shows up in regression tests and makes them die. Reported by Tom Lane. Discussion: https://postgr.es/m/489091.1593534251@sss.pgh.pa.us --- src/backend/access/brin/brin_revmap.c | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) diff --git a/src/backend/access/brin/brin_revmap.c b/src/backend/access/brin/brin_revmap.c index 9c4b3e2202..e8b8308f82 100644 --- a/src/backend/access/brin/brin_revmap.c +++ b/src/backend/access/brin/brin_revmap.c @@ -333,7 +333,6 @@ brinRevmapDesummarizeRange(Relation idxrel, BlockNumber heapBlk) OffsetNumber revmapOffset; OffsetNumber regOffset; ItemId lp; - BrinTuple *tup; revmap = brinRevmapInitialize(idxrel, &pagesPerRange, NULL); @@ -365,6 +364,10 @@ brinRevmapDesummarizeRange(Relation idxrel, BlockNumber heapBlk) regBuf = ReadBuffer(idxrel, ItemPointerGetBlockNumber(iptr)); LockBuffer(regBuf, BUFFER_LOCK_EXCLUSIVE); regPg = BufferGetPage(regBuf); + /* + * We're only removing data, not reading it, so there's no need to + * TestForOldSnapshot here. + */ /* if this is no longer a regular page, tell caller to start over */ if (!BRIN_IS_REGULAR_PAGE(regPg)) @@ -386,25 +389,14 @@ brinRevmapDesummarizeRange(Relation idxrel, BlockNumber heapBlk) ereport(ERROR, (errcode(ERRCODE_INDEX_CORRUPTED), errmsg("corrupted BRIN index: inconsistent range map"))); - tup = (BrinTuple *) PageGetItem(regPg, lp); - /* XXX apply sanity checks? Might as well delete a bogus tuple ... */ /* - * We're only removing data, not reading it, so there's no need to - * TestForOldSnapshot here. + * Placeholder tuples only appear during unfinished summarization, and we + * hold ShareUpdateExclusiveLock, so this function cannot run concurrently + * with that. So any placeholder tuples that exist are leftovers from a + * crashed or aborted summarization; remove them silently. */ - /* - * Because of ShareUpdateExclusive lock, this function shouldn't run - * concurrently with summarization. Placeholder tuples can only exist as - * leftovers from crashed summarization, so if we detect any, we complain - * but proceed. - */ - if (BrinTupleIsPlaceholder(tup)) - ereport(WARNING, - (errmsg("leftover placeholder tuple detected in BRIN index \"%s\", deleting", - RelationGetRelationName(idxrel)))); - START_CRIT_SECTION(); ItemPointerSetInvalid(&invalidIptr);