Prevent pgstats from getting confused when relkind of a relation changes#1614
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reshke wants to merge 1 commit intoapache:mainfrom
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Prevent pgstats from getting confused when relkind of a relation changes#1614reshke wants to merge 1 commit intoapache:mainfrom
reshke wants to merge 1 commit intoapache:mainfrom
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Just another auxiliary commit, for https://git.postgresql.org/cgit/postgresql.git/commit/?h=REL_14_STABLE&id=72ef1675e2bc502b31854b1c31ccf22fde7cde47 clean backport |
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When the relkind of a relache entry changes, because a table is converted into a view, pgstats can get confused in 15+, leading to crashes or assertion failures. For HEAD, Tom fixed this in b23cd18, by removing support for converting a table to a view, removing the source of the inconsistency. This commit just adds an assertion that a relcache entry's relkind does not change, just in case we end up with another case of that in the future. As there's no cases of changing relkind anymore, we can't add a test that that's handled correctly. For 15, fix the problem by not maintaining the association with the old pgstat entry when the relkind changes during a relcache invalidation processing. In that case the pgstat entry needs to be unlinked first, to avoid PgStat_TableStatus->relation getting out of sync. Also add a test reproducing the issues. No known problem exists in 11-14, so just add the test there. Reported-by: vignesh C <vignesh21@gmail.com> Author: Andres Freund <andres@anarazel.de> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CALDaNm2yXz+zOtv7y5zBd5WKT8O0Ld3YxikuU3dcyCvxF7gypA@mail.gmail.com Discussion: https://postgr.es/m/CALDaNm3oZA-8Wbps2Jd1g5_Gjrr-x3YWrJPek-mF5Asrrvz2Dg@mail.gmail.com Backpatch: 15-
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When the relkind of a relache entry changes, because a table is converted into a view, pgstats can get confused in 15+, leading to crashes or assertion failures.
For HEAD, Tom fixed this in b23cd18, by removing support for converting a table to a view, removing the source of the inconsistency. This commit just adds an assertion that a relcache entry's relkind does not change, just in case we end up with another case of that in the future. As there's no cases of changing relkind anymore, we can't add a test that that's handled correctly.
For 15, fix the problem by not maintaining the association with the old pgstat entry when the relkind changes during a relcache invalidation processing. In that case the pgstat entry needs to be unlinked first, to avoid PgStat_TableStatus->relation getting out of sync. Also add a test reproducing the issues.
No known problem exists in 11-14, so just add the test there.
Reported-by: vignesh C vignesh21@gmail.com
Author: Andres Freund andres@anarazel.de
Reviewed-by: Tom Lane tgl@sss.pgh.pa.us
Discussion: https://postgr.es/m/CALDaNm2yXz+zOtv7y5zBd5WKT8O0Ld3YxikuU3dcyCvxF7gypA@mail.gmail.com
Discussion: https://postgr.es/m/CALDaNm3oZA-8Wbps2Jd1g5_Gjrr-x3YWrJPek-mF5Asrrvz2Dg@mail.gmail.com
Backpatch: 15-
Fixes #ISSUE_Number
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make installcheckmake -C src/test installcheck-cbdb-parallelImpact
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