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Add 'logical_decoding_mode' GUC.

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This enables streaming or serializing changes immediately in logical
decoding. This parameter is intended to be used to test logical decoding
and replication of large transactions for which otherwise we need to
generate the changes till logical_decoding_work_mem is reached.

This helps in reducing the timing of existing tests related to logical
replication of in-progress transactions and will help in writing tests for
for the upcoming feature for parallelly applying large in-progress
transactions.

Author: Shi yu
Reviewed-by: Sawada Masahiko, Shveta Mallik, Amit Kapila, Dilip Kumar, Kuroda Hayato, Kyotaro Horiguchi
Discussion: https://postgr.es/m/OSZPR01MB63104E7449DBE41932DB19F1FD1B9@OSZPR01MB6310.jpnprd01.prod.outlook.com
This commit is contained in:
Amit Kapila
2022-12-26 08:58:16 +05:30
parent d3c0cc4447
commit 5de94a041e
9 changed files with 134 additions and 67 deletions
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28
doc/src/sgml/config.sgml
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@@ -11597,6 +11597,34 @@ LOG: CleanUpLock: deleting: lock(0xb7acd844) id(24688,24696,0,0,0,1)
</listitem>
</varlistentry>
<varlistentry id="guc-logical-decoding-mode" xreflabel="logical_decoding_mode">
<term><varname>logical_decoding_mode</varname> (<type>enum</type>)
<indexterm>
<primary><varname>logical_decoding_mode</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Allows streaming or serializing changes immediately in logical decoding.
The allowed values of <varname>logical_decoding_mode</varname> are
<literal>buffered</literal> and <literal>immediate</literal>. When set
to <literal>immediate</literal>, stream each change if
<literal>streaming</literal> option (see optional parameters set by
<link linkend="sql-createsubscription"><command>CREATE SUBSCRIPTION</command></link>)
is enabled, otherwise, serialize each change. When set to
<literal>buffered</literal>, which is the default, decoding will stream
or serialize changes when <varname>logical_decoding_work_mem</varname>
is reached.
</para>
<para>
This parameter is intended to be used to test logical decoding and
replication of large transactions for which otherwise we need to
generate the changes till <varname>logical_decoding_work_mem</varname>
is reached.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect1>
<sect1 id="runtime-config-short">