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Make pg_rewind skip files and directories that are removed during server start.

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The target cluster that was rewound needs to perform recovery from
the checkpoint created at failover, which leads it to remove or recreate
some files and directories that may have been copied from the source
cluster. So pg_rewind can skip synchronizing such files and directories,
and which reduces the amount of data transferred during a rewind
without changing the usefulness of the operation.

Author: Michael Paquier
Reviewed-by: Anastasia Lubennikova, Stephen Frost and me

Discussion: https://postgr.es/m/20180205071022.GA17337@paquier.xyz
This commit is contained in:
Fujii Masao
2018-03-29 04:56:52 +09:00
parent 09e96b3f35
commit 266b6acb31
3 changed files with 148 additions and 13 deletions
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14
doc/src/sgml/ref/pg_rewind.sgml
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@ -231,7 +231,19 @@ PostgreSQL documentation
<para>
Copy all other files such as <filename>pg_xact</filename> and
configuration files from the source cluster to the target cluster
(everything except the relation files).
(everything except the relation files). Similarly to base backups,
the contents of the directories <filename>pg_dynshmem/</filename>,
<filename>pg_notify/</filename>, <filename>pg_replslot/</filename>,
<filename>pg_serial/</filename>, <filename>pg_snapshots/</filename>,
<filename>pg_stat_tmp/</filename>, and
<filename>pg_subtrans/</filename> are omitted from the data copied
from the source cluster. Any file or directory beginning with
<filename>pgsql_tmp</filename> is omitted, as well as are
<filename>backup_label</filename>,
<filename>tablespace_map</filename>,
<filename>pg_internal.init</filename>,
<filename>postmaster.opts</filename> and
<filename>postmaster.pid</filename>.
</para>
</step>
<step>