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Transfer state pertaining to pending REINDEX operations to workers.

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This will allow the pending patch for parallel CREATE INDEX to work
on system catalogs, and to provide the same level of protection
against use of user indexes while they are being rebuilt that we
have for non-parallel CREATE INDEX.

Patch by me, reviewed by Peter Geoghegan.

Discussion: http://postgr.es/m/CA+TgmoYN-YQU9JsGQcqFLovZ-C+Xgp1_xhJQad=cunGG-_p5gg@mail.gmail.com
Discussion: http://postgr.es/m/CAH2-Wzkv4UNkXYhqQRqk-u9rS7h5c-4cCW+EqQ8K_WSeS43aZg@mail.gmail.com
This commit is contained in:
Robert Haas
2018-01-19 07:48:44 -05:00
parent 4e54dd2e0a
commit 29d58fd3ad
4 changed files with 98 additions and 2 deletions
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3
src/backend/access/transam/README.parallel
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@@ -122,6 +122,9 @@ worker. This includes:
values are restored, this incidentally sets SessionUserId and OuterUserId
to the correct values. This final step restores CurrentUserId.
- State related to pending REINDEX operations, which prevents access to
an index that is currently being rebuilt.
To prevent undetected or unprincipled deadlocks when running in parallel mode,
this could should eventually handle heavyweight locks in some way. This is
not implemented yet.