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Disable pg_standby -l option because the backend doesn't expect the recovered 

file to be a symlink. We tried to fix this issue with an earlier server-side
patch, but it didn't fix the whole issue.

The same bug is present in older releases as well, but the 8.4 train is
about to leave the station, and I'm not sure if have consensus on whether
we can remove the -l option in back-branches or do we need to attempt a
server-side fix to make symlinking safe.

Patch by Simon Riggs, per discussion on bug identified by Fujii Masao.
This commit is contained in:
Heikki Linnakangas 2009-06-25 12:03:11 +00:00
parent 6c4637a3b3
commit 8fd733bd19
2 changed files with 11 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
contrib/pg_standby/pg_standby.c
View File

@ -1,5 +1,5 @@
/*
* $PostgreSQL: pgsql/contrib/pg_standby/pg_standby.c,v 1.24 2009/06/18 10:08:08 heikki Exp $
* $PostgreSQL: pgsql/contrib/pg_standby/pg_standby.c,v 1.25 2009/06/25 12:03:10 heikki Exp $
*
*
* pg_standby.c
@ -523,7 +523,7 @@ usage(void)
printf(" -d generate lots of debugging output (testing only)\n");
printf(" -k NUMFILESTOKEEP if RESTARTWALFILE not used, removes files prior to limit\n"
" (0 keeps all)\n");
printf(" -l links into archive (leaves file in archive)\n");
printf(" -l does nothing; use of link is now deprecated\n");
printf(" -r MAXRETRIES max number of times to retry, with progressive wait\n"
" (default=3)\n");
printf(" -s SLEEPTIME seconds to wait between file checks (min=1, max=60,\n"
@ -610,7 +610,12 @@ main(int argc, char **argv)
}
break;
case 'l': /* Use link */
restoreCommandType = RESTORE_COMMAND_LINK;
/*
* Link feature disabled, possibly permanently. Linking
* causes a problem after recovery ends that is not currently
* resolved by PostgreSQL. 25 Jun 2009
restoreCommandType = RESTORE_COMMAND_LINK;
*/
break;
case 'r': /* Retries */
maxretries = atoi(optarg);

28
doc/src/sgml/pgstandby.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgstandby.sgml,v 2.9 2009/05/14 21:59:22 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgstandby.sgml,v 2.10 2009/06/25 12:03:11 heikki Exp $ -->
<sect1 id="pgstandby">
<title>pg_standby</title>
@ -25,11 +25,6 @@
<application>pg_standby</application> features include:
</para>
<itemizedlist>
<listitem>
<para>
Supports copy or link for restoring WAL files
</para>
</listitem>
<listitem>
<para>
Written in C, so very portable and easy to install
@ -171,23 +166,11 @@ pg_standby <optional> <replaceable>option</> ... </optional> <replaceable>archiv
archive space.
</entry>
</row>
<row>
<entry><literal>-l</></entry>
<entry>no</entry>
<entry>
Use <literal>ln</> command to restore WAL files from archive.
Link is more efficient than copy, but the default is copy since link
will not work in all scenarios.
On Windows, this option uses the <literal>mklink</> command
to provide a file-to-file symbolic link. <literal>-l</> will
not work on versions of Windows prior to Vista.
</entry>
</row>
<row>
<entry><literal>-r</> <replaceable>maxretries</></entry>
<entry>3</entry>
<entry>
Set the maximum number of times to retry the copy or link command if it
Set the maximum number of times to retry the copy command if it
fails. After each failure, we wait for <replaceable>sleeptime</> *
<replaceable>num_retries</>
so that the wait time increases progressively. So by default,
@ -242,7 +225,7 @@ pg_standby <optional> <replaceable>option</> ... </optional> <replaceable>archiv
<programlisting>
archive_command = 'cp %p .../archive/%f'
restore_command = 'pg_standby -l -d -s 2 -t /tmp/pgsql.trigger.5442 .../archive %f %p %r 2>>standby.log'
restore_command = 'pg_standby -d -s 2 -t /tmp/pgsql.trigger.5442 .../archive %f %p %r 2>>standby.log'
recovery_end_command = 'rm -f /tmp/pgsql.trigger.5442'
</programlisting>
@ -253,11 +236,6 @@ recovery_end_command = 'rm -f /tmp/pgsql.trigger.5442'
This will:
</para>
<itemizedlist>
<listitem>
<para>
use the <literal>ln</> command to restore WAL files from archive
</para>
</listitem>
<listitem>
<para>
produce debugging output in <filename>standby.log</>