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authorThomas Munro2018-09-20 02:02:40 +0000
committerThomas Munro2018-09-20 02:21:57 +0000
commitde4fe83c7e6d14d996babec814c4fc12490889ef (patch)
treeb0c4099a0f10fd60a7e2043608f412109c2a3d3a /doc/src
parent265ac024572b639eb315eab1b68faf45bcc8f4f2 (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
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