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Allow walreceiver configuration to change on reload

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The parameters primary_conninfo, primary_slot_name and
wal_receiver_create_temp_slot can now be changed with a simple "reload"
signal, no longer requiring a server restart.  This is achieved by
signalling the walreceiver process to terminate and having it start
again with the new values.

Thanks to Andres Freund, Kyotaro Horiguchi, Fujii Masao for discussion.

Author: Sergei Kornilov <sk@zsrv.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/19513901543181143@sas1-19a94364928d.qloud-c.yandex.net
This commit is contained in:
Alvaro Herrera
2020-03-27 19:43:41 -03:00
parent 092c6936de
commit 1e6148032e
10 changed files with 179 additions and 68 deletions
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6
src/backend/access/transam/xlogreader.c
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@ -585,9 +585,9 @@ ReadPageInternal(XLogReaderState *state, XLogRecPtr pageptr, int reqLen)
/*
* Data is not in our buffer.
*
* Every time we actually read the page, even if we looked at parts of it
* before, we need to do verification as the read_page callback might now
* be rereading data from a different source.
* Every time we actually read the segment, even if we looked at parts of
* it before, we need to do verification as the read_page callback might
* now be rereading data from a different source.
*
* Whenever switching to a new WAL segment, we read the first page of the
* file and validate its header, even if that's not where the target