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| author | Thomas Munro <tmunro@postgresql.org> | 2018-09-20 14:02:56 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2018-09-20 14:21:32 +1200 |
| commit | 9d178fb928040f1a5ab5b566f1ec76d7ac554587 (patch) | |
| tree | 2fcd77f89d2352b013920712bf2b76fa13b0ffdd /src/tutorial/advanced.source | |
| parent | 6449616419c59c3223b3c4f731cefa3d77fac567 (diff) | |
Defer restoration of libraries in parallel workers.
Several users of extensions complained of crashes in parallel workers
that turned out to be due to syscache access from their _PG_init()
functions. Reorder the initialization of parallel workers so that
libraries are restored after the caches are initialized, and inside a
transaction.
This was reported in bug #15350 and elsewhere. We don't consider it
to be a bug: extensions shouldn't do that, because then they can't be
used in shared_preload_libraries. However, it's a fairly obscure
hazard and these extensions worked in practice before parallel query
came along. So let's make it work. Later commits might add a warning
message and eventually an error.
Back-patch to 9.6, where parallel query landed.
Author: Thomas Munro
Reviewed-by: Amit Kapila
Reported-by: Kieran McCusker, Jimmy
Discussion: https://postgr.es/m/153512195228.1489.8545997741965926448%40wrigleys.postgresql.org
Diffstat (limited to 'src/tutorial/advanced.source')
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