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doc: pg_upgrade, clarify standby servers must remain running
Also mention that mismatching primary/standby LSNs should never happen. Reported-by: Nikolay Samokhvalov Discussion: https://postgr.es/m/CAM527d8heqkjG5VrvjU3Xjsqxg41ufUyabD9QZccdAxnpbRH-Q@mail.gmail.com Backpatch-through: 11
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@ -380,8 +380,8 @@ NET STOP postgresql-&majorversion;
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</para>
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<para>
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Streaming replication and log-shipping standby servers can
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remain running until a later step.
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Streaming replication and log-shipping standby servers must be
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running during this shutdown so they receive all changes.
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</para>
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</step>
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@ -394,8 +394,6 @@ NET STOP postgresql-&majorversion;
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servers are caught up by running <application>pg_controldata</application>
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against the old primary and standby clusters. Verify that the
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<quote>Latest checkpoint location</quote> values match in all clusters.
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(There will be a mismatch if old standby servers were shut down
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before the old primary or if the old standby servers are still running.)
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Also, make sure <varname>wal_level</varname> is not set to
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<literal>minimal</literal> in the <filename>postgresql.conf</filename> file on the
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new primary cluster.
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