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Commit95e3d50

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doc: Refine documentation about recovery command exist status
Add more documentation about how different exit codes and signals arehandled in each case.Reviewed-by: Peter Geoghegan <pg@heroku.com>
1 parentfef88b3 commit95e3d50

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2 files changed

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‎doc/src/sgml/backup.sgml

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@@ -1084,9 +1084,17 @@ restore_command = 'cp /mnt/server/archivedir/%f %p'
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<para>
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It is important that the command return nonzero exit status on failure.
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The command <emphasis>will</> be called requesting files that are not present
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in the archive; it must return nonzero when so asked. This is not an
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error condition. Not all of the requested files will be WAL segment
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The command <emphasis>will</> be called requesting files that are not
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present in the archive; it must return nonzero when so asked. This is not
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an error condition. An exception is that if the command was terminated by
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a signal (other than <systemitem>SIGTERM</systemitem>, which is used as
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part of a database server shutdown) or an error by the shell (such as
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command not found), then recovery will abort and the server will not start
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up.
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</para>
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<para>
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Not all of the requested files will be WAL segment
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files; you should also expect requests for files with a suffix of
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<literal>.backup</> or <literal>.history</>. Also be aware that
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the base name of the <literal>%p</> path will be different from

‎doc/src/sgml/recovery-config.sgml

Lines changed: 11 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -70,6 +70,10 @@
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restore_command = 'cp /mnt/server/archivedir/%f "%p"'
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restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
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</programlisting>
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An exception is that if the command was terminated by a signal (other
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than <systemitem>SIGTERM</systemitem>, which is used as part of a
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database server shutdown) or an error by the shell (such as command
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not found), then recovery will abort and the server will not start up.
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</para>
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</listitem>
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</varlistentry>
@@ -106,8 +110,10 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
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command.
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</para>
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<para>
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If the command returns a non-zero exit status then a WARNING log
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message will be written.
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If the command returns a nonzero exit status then a warning log
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message will be written. An exception is that if the command was
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terminated by a signal or an error by the shell (such as command not
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found), a fatal error will be raised.
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</para>
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</listitem>
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</varlistentry>
@@ -127,10 +133,11 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
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last valid restart point, like in <xref linkend="archive-cleanup-command">.
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</para>
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<para>
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If the command returns anon-zero exit status then aWARNING log
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If the command returns anonzero exit status then awarning log
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message will be written and the database will proceed to start up
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anyway. An exception is that if the command was terminated by a
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signal, the database will not proceed with startup.
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signal or an error by the shell (such as command not found), the
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database will not proceed with startup.
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</para>
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</listitem>
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</varlistentry>

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