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Make WAL-related utilities handle .partial WAL files properly.

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Commit de76884 changed an archive recovery so that the last WAL
segment with old timeline was renamed with suffix .partial. It should
have updated WAL-related utilities so that they can handle such
.paritial WAL files, but we forgot that.

This patch changes pg_archivecleanup so that it can clean up even
archived WAL files with .partial suffix. Also it allows us to specify
.partial WAL file name as the command-line argument "oldestkeptwalfile".

This patch also changes pg_resetxlog so that it can remove .partial
WAL files in pg_xlog directory.

pg_xlogdump cannot handle .partial WAL files. Per discussion,
we decided only to document that limitation instead of adding the fix.
Because a user can easily work around the limitation (i.e., just remove
.partial suffix from the file name) and the fix seems complicated for
very narrow use case.

Back-patch to 9.5 where the problem existed.

Review by Michael Paquier.
Discussion: http://www.postgresql.org/message-id/CAHGQGwGxMKnVHGgTfiig2Bt_2djec0in3-DLJmtg7+nEiidFdQ@mail.gmail.com
This commit is contained in:
Fujii Masao
2015-07-03 11:53:58 +09:00
parent 69e9f9639d
commit eeaf1b6afa
4 changed files with 43 additions and 10 deletions
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6
doc/src/sgml/ref/pg_xlogdump.sgml
View File

@ -215,6 +215,12 @@ PostgreSQL documentation
Only the specified timeline is displayed (or the default, if none is
specified). Records in other timelines are ignored.
</para>
<para>
<application>pg_xlogdump</> cannot read WAL files with suffix
<literal>.partial</>. If those files need to be read, <literal>.partial</>
suffix needs to be removed from the filename.
</para>
</refsect1>
<refsect1>

6
doc/src/sgml/ref/pgarchivecleanup.sgml
View File

@ -60,8 +60,10 @@ archive_cleanup_command = 'pg_archivecleanup <replaceable>archivelocation</> %r'
<para>
When used as a standalone program all WAL files logically preceding the
<replaceable>oldestkeptwalfile</> will be removed from <replaceable>archivelocation</>.
In this mode, if you specify a <filename>.backup</> file name, then only the file prefix
will be used as the <replaceable>oldestkeptwalfile</>. This allows you to remove
In this mode, if you specify a <filename>.partial</> or <filename>.backup</>
file name, then only the file prefix will be used as the
<replaceable>oldestkeptwalfile</>. This treatment of <filename>.backup</>
file name allows you to remove
all WAL files archived prior to a specific base backup without error.
For example, the following example will remove all files older than
WAL file name <filename>000000010000003700000010</>: