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Allow pg_rewind to use a standby server as the source system.

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Using a hot standby server as the source has not been possible, because
pg_rewind creates a temporary table in the source system, to hold the
list of file ranges that need to be fetched. Refactor it to queue up the
file fetch requests in pg_rewind's memory, so that the temporary table
is no longer needed.

Also update the logic to compute 'minRecoveryPoint' correctly, when the
source is a standby server.

Reviewed-by: Kyotaro Horiguchi, Soumyadeep Chakraborty
Discussion: https://www.postgresql.org/message-id/0c5b3783-af52-3ee5-f8fa-6e794061f70d%40iki.fi
This commit is contained in:
Heikki Linnakangas
2020-11-12 14:52:24 +02:00
parent 1b2b19f758
commit 9c4f5192f6
5 changed files with 484 additions and 108 deletions
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doc/src/sgml/ref/pg_rewind.sgml
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@@ -173,7 +173,7 @@ PostgreSQL documentation
with a role having sufficient permissions to execute the functions
used by <application>pg_rewind</application> on the source server
(see Notes section for details) or a superuser role. This option
requires the source server to be running and not in recovery mode.
requires the source server to be running and accepting connections.
</para>
</listitem>
</varlistentry>