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Allow users to limit storage reserved by replication slots

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Replication slots are useful to retain data that may be needed by a
replication system.  But experience has shown that allowing them to
retain excessive data can lead to the primary failing because of running
out of space.  This new feature allows the user to configure a maximum
amount of space to be reserved using the new option
max_slot_wal_keep_size.  Slots that overrun that space are invalidated
at checkpoint time, enabling the storage to be released.

Author: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Jehan-Guillaume de Rorthais <jgdr@dalibo.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20170228.122736.123383594.horiguchi.kyotaro@lab.ntt.co.jp
This commit is contained in:
Alvaro Herrera
2020-04-07 18:35:00 -04:00
parent b63c293bcb
commit c655077639
17 changed files with 595 additions and 43 deletions
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13
src/backend/utils/misc/guc.c
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@ -2784,6 +2784,19 @@ static struct config_int ConfigureNamesInt[] =
NULL, NULL, NULL
},
{
{"max_slot_wal_keep_size", PGC_SIGHUP, REPLICATION_SENDING,
gettext_noop("Sets the maximum WAL size that can be reserved by replication slots."),
gettext_noop("Replication slots will be marked as failed, and segments released "
"for deletion or recycling, if this much space is occupied by WAL "
"on disk."),
GUC_UNIT_MB
},
&max_slot_wal_keep_size_mb,
-1, -1, MAX_KILOBYTES,
NULL, NULL, NULL
},
{
{"wal_sender_timeout", PGC_USERSET, REPLICATION_SENDING,
gettext_noop("Sets the maximum time to wait for WAL replication."),