Move I/O before the index_update_stats() buffer lock region.
Commit a07e03fd8fa7daf4d1356f7cb501ffe784ea6257 enlarged the work done
here under the pg_class heap buffer lock. Two preexisting actions are
best done before holding that lock. Both RelationGetNumberOfBlocks()
and visibilitymap_count() do I/O, and the latter might exclusive-lock a
visibility map buffer. Moving these reduces contention and risk of
undetected LWLock deadlock. Back-patch to v12, like that commit.
Discussion: https://postgr.es/m/20241031200139.b4@rfd.leadboat.com
Branch
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REL_17_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/0bcb9d07940c790912b0aff781ef605ec22e1a2d
Modified Files
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src/backend/catalog/index.c | 62 +++++++++++++++++++++++++++++----------------
1 file changed, 40 insertions(+), 22 deletions(-)
