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Commit8321c58

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author
Liudmila Mantrova
committed
DOC: added docs for referee extension
1 parent890888a commit8321c58

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‎doc/src/sgml/contrib.sgml

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@@ -153,6 +153,7 @@ CREATE EXTENSION <replaceable>module_name</> FROM unpackaged;
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&pg-wait-sampling;
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&plantuner;
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&postgres-fdw;
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&referee;
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&rum;
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&seg;
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&sepgsql;

‎doc/src/sgml/filelist.sgml

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@@ -164,6 +164,7 @@
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<!ENTITY pgvisibility SYSTEM "pgvisibility.sgml">
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<!ENTITY pg-wait-sampling SYSTEM "pg-wait-sampling.sgml">
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<!ENTITY postgres-fdw SYSTEM "postgres-fdw.sgml">
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<!ENTITY referee SYSTEM "referee.sgml">
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<!ENTITY rum SYSTEM "rum.sgml">
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<!ENTITY plantuner SYSTEM "plantuner.sgml">
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<!ENTITY seg SYSTEM "seg.sgml">

‎doc/src/sgml/referee.sgml

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<sect1 id="referee">
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<title>referee</title>
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<para>
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<filename>referee</filename> is a <productname>&productname;</productname>
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extension for managing quorum settings in clusters with an even number
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of nodes configured with <link linkend="multimaster">multimaster</link>.
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Installed on a separate system, the <filename>referee</filename>
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extension provides a voting node to assign the quorum status to a subset
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of nodes if only half of the cluster nodes remain connected to each other.
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</para>
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<para>
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If a multi-master cluster is split into equal parts, or half of the
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cluster nodes fail, each subset of nodes that equals half of the
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cluster tries to access the referee.
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The first subset that gets connected to the referee wins the voting
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and continues working, while all the other nodes are excluded from
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the cluster to avoid split-brain problems.
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</para>
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<para>
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The referee node does not store any cluster data, so it is very lightweight
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and can be located on systems with limited resources. For details on how
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to set up and use a referee node with <filename>multimaster</filename>,
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see <xref linkend="setting-up-a-referee">.
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</para>
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<sect2>
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<title>Authors</title>
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<para>Postgres Professional, Moscow, Russia</para>
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</sect2>
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</sect1>

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