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Fix broken logic in lazy_vacuum_heap.

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As noted by Tom Lane, the previous coding in this area, which I
introduced in commit bbb6e559c4, was
poorly tested and caused the vacuum's second heap to go into what would
have been an infinite loop but for the fact that it eventually caused a
memory allocation failure.  This version seems to work better.
This commit is contained in:
Robert Haas 2012-01-13 08:22:31 -05:00
parent 4d0b11a0ca
commit d0dcb315db
1 changed files with 4 additions and 0 deletions
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4
src/backend/commands/vacuumlazy.c
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@ -991,7 +991,11 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
buf = ReadBufferExtended(onerel, MAIN_FORKNUM, tblk, RBM_NORMAL, buf = ReadBufferExtended(onerel, MAIN_FORKNUM, tblk, RBM_NORMAL,
vac_strategy); vac_strategy);
if (!ConditionalLockBufferForCleanup(buf)) if (!ConditionalLockBufferForCleanup(buf))
{
ReleaseBuffer(buf);
++tupindex;
continue; continue;
}
tupindex = lazy_vacuum_page(onerel, tblk, buf, tupindex, vacrelstats); tupindex = lazy_vacuum_page(onerel, tblk, buf, tupindex, vacrelstats);
/* Now that we've compacted the page, record its available space */ /* Now that we've compacted the page, record its available space */