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Automatically terminate replication connections that are idle for more

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than replication_timeout (a new GUC) milliseconds. The TCP timeout is often
too long, you want the master to notice a dead connection much sooner.
People complained about that in 9.0 too, but with synchronous replication
it's even more important to notice dead connections promptly.

Fujii Masao and Heikki Linnakangas
This commit is contained in:
Heikki Linnakangas
2011-03-30 10:10:32 +03:00
parent bc03c5937d
commit 754baa21f7
11 changed files with 368 additions and 129 deletions
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28
doc/src/sgml/config.sgml
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@ -2019,6 +2019,29 @@ SET ENABLE_SEQSCAN TO OFF;
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-replication-timeout" xreflabel="replication_timeout">
<term><varname>replication_timeout</varname> (<type>integer</type>)</term>
<indexterm>
<primary><varname>replication_timeout</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Terminate replication connections that are inactive longer
than the specified number of milliseconds. This is useful for
the primary server to detect a standby crash or network outage.
A value of zero means wait forever. This parameter can only be set in
the <filename>postgresql.conf</> file or on the server command line.
The default value is 60 seconds.
</para>
<para>
To prevent connections from being terminated prematurely,
<xref linkend="guc-wal-receiver-status-interval">
must be enabled on the standby, and its value must be less than the
value of <varname>replication_timeout</>.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
@ -2216,6 +2239,11 @@ SET ENABLE_SEQSCAN TO OFF;
the <filename>postgresql.conf</> file or on the server command line.
The default value is 10 seconds.
</para>
<para>
When <xref linkend="guc-replication-timeout"> is enabled on the primary,
<varname>wal_receiver_status_interval</> must be enabled, and its value
must be less than the value of <varname>replication_timeout</>.
</para>
</listitem>
</varlistentry>