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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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16
doc/src/sgml/config.sgml
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@ -2151,6 +2151,22 @@ include_dir 'conf.d'
</listitem>
</varlistentry>
<varlistentry id="guc-max-notify-queue-pages" xreflabel="max_notify_queue_pages">
<term><varname>max_notify_queue_pages</varname> (<type>integer</type>)
<indexterm>
<primary><varname>max_notify_queue_pages</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Specifies the maximum amount of allocated pages for
<xref linkend="sql-notify"/> / <xref linkend="sql-listen"/> queue.
The default value is 1048576. For 8 KB pages it allows to consume
up to 8 GB of disk space.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>

1
doc/src/sgml/ref/listen.sgml
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@ -148,6 +148,7 @@ Asynchronous notification "virtual" received from server process with PID 8448.
<simplelist type="inline">
<member><xref linkend="sql-notify"/></member>
<member><xref linkend="sql-unlisten"/></member>
<member><xref linkend="guc-max-notify-queue-pages"/></member>
</simplelist>
</refsect1>
</refentry>

1
doc/src/sgml/ref/notify.sgml
View File

@ -228,6 +228,7 @@ Asynchronous notification "foo" with payload "payload" received from server proc
<simplelist type="inline">
<member><xref linkend="sql-listen"/></member>
<member><xref linkend="sql-unlisten"/></member>
<member><xref linkend="guc-max-notify-queue-pages"/></member>
</simplelist>
</refsect1>
</refentry>