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Update pgxn/neon/pagestore_smgr.c

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Co-authored-by: Heikki Linnakangas <heikki@neon.tech>
This commit is contained in:
Konstantin Knizhnik
2025-07-22 18:51:38 +03:00
committed by Konstantin Knizhnik
parent 28ce584d01
commit 4580391963
1 changed files with 3 additions and 2 deletions
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pgxn/neon/pagestore_smgr.c
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@@ -1617,8 +1617,9 @@ neon_write(SMgrRelation reln, ForkNumber forknum, BlockNumber blocknum, const vo
relperst = mdexists(reln, debug_compare_local ? INIT_FORKNUM : forknum) ? NEON_RELPERSISTENCE_UNLOGGED : NEON_RELPERSISTENCE_PERMANENT;
/*
* There is no lock hold between get_cached_relperst and set_cached_relperst.
* We assume that multiple backends can repeat this check and get the same result (there is assert in set_cached_relperst).
* And concurrent setting UNLOGGED_BUILD is not possible because only one backend can perform unlogged build.
* We assume that if multiple backends perform this check, they all get the same result (there is assert in set_cached_relperst).
* Furthermore we assume that when a relation changes from PERMANENT to UNLOGGED_BUILD, we assume that it has no buffers in
* the shared buffer cache and therefore no other backend will try to concurrently write its pages. (In fact we require that the relation is completely empty.)
*/
set_cached_relperst(rinfo, relperst);
}