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Allow archiving via loadable modules.

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Running a shell command for each file to be archived has a lot of
overhead and may not offer as much error checking as you want, or the
exact semantics that you want. So, offer the option to call a loadable
module for each file to be archived, rather than running a shell command.

Also, add a 'basic_archive' contrib module as an example implementation
that archives to a local directory.

Nathan Bossart, with a little bit of kibitzing by me.

Discussion: http://postgr.es/m/20220202224433.GA1036711@nathanxps13
This commit is contained in:
Robert Haas
2022-02-03 13:57:27 -05:00
parent 7c1aead6cb
commit 5ef1eefd76
26 changed files with 941 additions and 67 deletions
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4
doc/src/sgml/ref/pg_basebackup.sgml
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@@ -102,8 +102,8 @@ PostgreSQL documentation
<para>
All WAL records required for the backup must contain sufficient full-page writes,
which requires you to enable <varname>full_page_writes</varname> on the primary and
not to use a tool like <application>pg_compresslog</application> as
<varname>archive_command</varname> to remove full-page writes from WAL files.
not to use a tool in your <varname>archive_library</varname> to remove
full-page writes from WAL files.
</para>
</listitem>
</itemizedlist>