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Fix broken logic in lazy_vacuum_heap.
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.
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@ -991,7 +991,11 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
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buf = ReadBufferExtended(onerel, MAIN_FORKNUM, tblk, RBM_NORMAL,
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vac_strategy);
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if (!ConditionalLockBufferForCleanup(buf))
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{
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ReleaseBuffer(buf);
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++tupindex;
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continue;
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}
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tupindex = lazy_vacuum_page(onerel, tblk, buf, tupindex, vacrelstats);
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/* Now that we've compacted the page, record its available space */
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