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Use larger segment file names for pg_notify

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This avoids the wraparound in async.c and removes the corresponding code
complexity. The maximum amount of allocated SLRU pages for NOTIFY / LISTEN
queue is now determined by the max_notify_queue_pages GUC. The default
value is 1048576. It allows to consume up to 8 GB of disk space which is
exactly the limit we had previously.

Author: Maxim Orlov, Aleksander Alekseev, Alexander Korotkov, Teodor Sigaev
Author: Nikita Glukhov, Pavel Borisov, Yura Sokolov
Reviewed-by: Jacob Champion, Heikki Linnakangas, Alexander Korotkov
Reviewed-by: Japin Li, Pavel Borisov, Tom Lane, Peter Eisentraut, Andres Freund
Reviewed-by: Andrey Borodin, Dilip Kumar, Aleksander Alekseev
Discussion: https://postgr.es/m/CACG%3DezZe1NQSCnfHOr78AtAZxJZeCvxrts0ygrxYwe%3DpyyjVWA%40mail.gmail.com
Discussion: https://postgr.es/m/CAJ7c6TPDOYBYrnCAeyndkBktO0WG2xSdYduTF0nxq%2BvfkmTF5Q%40mail.gmail.com
This commit is contained in:
Alexander Korotkov
2023-11-29 01:41:48 +02:00
parent 4ed8f0913b
commit 2cdf131c46
7 changed files with 62 additions and 92 deletions
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10
src/backend/utils/misc/guc_tables.c
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@ -2687,6 +2687,16 @@ struct config_int ConfigureNamesInt[] =
NULL, NULL, NULL
},
{
{"max_notify_queue_pages", PGC_POSTMASTER, RESOURCES_DISK,
gettext_noop("Sets the maximum number of allocated pages for NOTIFY / LISTEN queue."),
NULL,
},
&max_notify_queue_pages,
1048576, 64, INT_MAX,
NULL, NULL, NULL
},
{
{"wal_decode_buffer_size", PGC_POSTMASTER, WAL_RECOVERY,
gettext_noop("Buffer size for reading ahead in the WAL during recovery."),