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18 lines
925 B
Plaintext
18 lines
925 B
Plaintext
<chapter id="repmgrd-cascading-replication">
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<title>repmgrd and cascading replication</title>
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<para>
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Cascading replication - where a standby can connect to an upstream node and not
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the primary server itself - was introduced in PostgreSQL 9.2. &repmgr; and
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<command>repmgrd</command> support cascading replication by keeping track of the relationship
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between standby servers - each node record is stored with the node id of its
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upstream ("parent") server (except of course the primary server).
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</para>
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<para>
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In a failover situation where the primary node fails and a top-level standby
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is promoted, a standby connected to another standby will not be affected
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and continue working as normal (even if the upstream standby it's connected
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to becomes the primary node). If however the node's direct upstream fails,
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the "cascaded standby" will attempt to reconnect to that node's parent.
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</para>
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</chapter>
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