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Commit9c4f519

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Allow pg_rewind to use a standby server as the source system.
Using a hot standby server as the source has not been possible, becausepg_rewind creates a temporary table in the source system, to hold thelist of file ranges that need to be fetched. Refactor it to queue up thefile fetch requests in pg_rewind's memory, so that the temporary tableis no longer needed.Also update the logic to compute 'minRecoveryPoint' correctly, when thesource is a standby server.Reviewed-by: Kyotaro Horiguchi, Soumyadeep ChakrabortyDiscussion:https://www.postgresql.org/message-id/0c5b3783-af52-3ee5-f8fa-6e794061f70d%40iki.fi
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‎doc/src/sgml/ref/pg_rewind.sgml

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@@ -173,7 +173,7 @@ PostgreSQL documentation
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with a role having sufficient permissions to execute the functions
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used by <application>pg_rewind</application> on the source server
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(see Notes section for details) or a superuser role. This option
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requires the source server to be running andnot in recovery mode.
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requires the source server to be running andaccepting connections.
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</para>
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</listitem>
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</varlistentry>

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