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Enable repmgr standby switchover for 9.3/9.4 by recloning

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A bit of a hack and unsuited for large databases - install
pg_rewind instead. Or upgrade to 9.5.
This commit is contained in:
Ian Barwick
2016-01-20 14:51:16 +09:00
parent f60e7346e2
commit 8ac5a5444e
1 changed files with 54 additions and 7 deletions
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61
repmgr.c
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@@ -2678,18 +2678,24 @@ do_standby_switchover(void)
/* TODO: check file actually exists on remote */
}
else
{
use_pg_rewind = false;
}
}
/*
* SANITY CHECKS completed
* Sanity checks completed - prepare for the switchover
*/
/*
* When using pg_rewind (the preferable option), we need to
* archive any configuration files in the remote server's
* data directory as they'll be overwritten by pg_rewind
* When using pg_rewind (the preferable option, and default from 9.5
* onwards), we need to archive any configuration files in the remote
* server's data directory as they'll be overwritten by pg_rewind
*
* Possible todo item: enable the archive location to be specified
* by the user
*/
if (use_pg_rewind == true)
{
@@ -2870,8 +2876,51 @@ do_standby_switchover(void)
termPQExpBuffer(&command_output);
termPQExpBuffer(&recovery_done_remove);
}
else
{
/*
* For 9.3/9.4, if pg_rewind is not available on the remote server,
* we'll need to force a reclone of the standby sing rsync - this may
* take some time on larger databases, so use with care!
*
* Note that following this clone we'll be using `repmgr standby follow`
* to start the server - that will mean recovery.conf will be created
* for a second time, but as this is a workaround for the absence
* of pg_rewind. It's preferable to have `repmgr standby follow` start
* the remote database as it can access the remote config file
* directly.
*/
format_db_cli_params(options.conninfo, repmgr_db_cli_params);
maxlen_snprintf(command,
"%s/repmgr -D %s -f %s %s --rsync-only --force --ignore-external-config-files standby clone",
pg_bindir,
remote_data_directory,
runtime_options.remote_config_file,
repmgr_db_cli_params
);
log_debug("Executing:\n%s\n", command);
initPQExpBuffer(&command_output);
(void)remote_command(
remote_host,
runtime_options.remote_user,
command,
&command_output);
termPQExpBuffer(&command_output);
}
/*
* Execute `repmgr standby follow` to create recovery.conf and start
* the remote server
*/
format_db_cli_params(options.conninfo, repmgr_db_cli_params);
maxlen_snprintf(command,
"%s/repmgr -D %s -f %s %s standby follow",
@@ -2885,8 +2934,6 @@ do_standby_switchover(void)
initPQExpBuffer(&command_output);
// XXX handle failure
(void)remote_command(
remote_host,
runtime_options.remote_user,