diff options
| author | Michael Paquier <michael@paquier.xyz> | 2018-07-11 08:56:24 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2018-07-11 08:56:24 +0900 |
| commit | 56a714721343e6f52c0b1b911c0f160592348e84 (patch) | |
| tree | 58344b8c0a3aa8cd5a570d7b55cae34cbfb922c8 /doc/src | |
| parent | b6e3a3a492dbf2043e4b149221007716ba9e364e (diff) | |
Block replication slot advance for these not yet reserving WAL
Such replication slots are physical slots freshly created without WAL
being reserved, which is the default behavior, which have not been used
yet as WAL consumption resources to retain WAL. This prevents advancing
a slot to a position older than any WAL available, which could falsify
calculations for WAL segment recycling.
This also cleans up a bit the code, as ReplicationSlotRelease() would be
called on ERROR, and improves error messages.
Reported-by: Kyotaro Horiguchi
Author: Michael Paquier
Reviewed-by: Andres Freund, Álvaro Herrera, Kyotaro Horiguchi
Discussion: https://postgr.es/m/20180626071305.GH31353@paquier.xyz
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/catalogs.sgml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml index 3ed9021c2fc..4851bc2e248 100644 --- a/doc/src/sgml/catalogs.sgml +++ b/doc/src/sgml/catalogs.sgml @@ -9867,7 +9867,8 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx <entry></entry> <entry>The address (<literal>LSN</literal>) of oldest WAL which still might be required by the consumer of this slot and thus won't be - automatically removed during checkpoints. + automatically removed during checkpoints. <literal>NULL</literal> + if the <literal>LSN</literal> of this slot has never been reserved. </entry> </row> |