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Enable use of pg_rewind during switchover operations

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But only if required and --force-rewind required, and pg_rewind
can actually be used.
This commit is contained in:
Ian Barwick
2017-08-09 12:09:37 +09:00
parent 2553839630
commit b1e544f962
6 changed files with 324 additions and 59 deletions
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90
repmgr-action-standby.c
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@@ -1598,6 +1598,8 @@ do_standby_switchover(void)
XLogRecPtr remote_last_checkpoint_lsn = InvalidXLogRecPtr;
ReplInfo replication_info = T_REPLINFO_INTIALIZER;
/* store list of configuration files on the demotion candidate */
KeyValueList remote_config_files = { NULL, NULL };
/*
* SANITY CHECKS
@@ -1701,7 +1703,8 @@ do_standby_switchover(void)
/*
* If --force-rewind specified, check pg_rewind can be used
* If --force-rewind specified, check pg_rewind can be used, and pre-emptively
* fetch the list of configuration files which should be archived
*/
if (runtime_options.force_rewind == true)
@@ -1722,6 +1725,8 @@ do_standby_switchover(void)
}
termPQExpBuffer(&reason);
get_datadir_configuration_files(remote_conn, &remote_config_files);
}
@@ -2153,33 +2158,72 @@ do_standby_switchover(void)
}
/* promote standby */
_do_standby_promote_internal(config_file_options.data_directory);
if (replication_info.last_wal_receive_lsn < remote_last_checkpoint_lsn)
if (1 || replication_info.last_wal_receive_lsn < remote_last_checkpoint_lsn)
{
// if --force-rewind was supplied, do that now, otherwise exit
KeyValueListCell *cell;
bool first_entry = true;
if (runtime_options.force_rewind == false)
{
log_error(_("new primary diverges from former primary and --force-rewind not provided"));
/* TODO: "repmgr node rejoin" example, when available */
log_hint(_("the former primary will need to be restored manually"));
PQfinish(local_conn);
exit(ERR_SWITCHOVER_FAIL);
}
initPQExpBuffer(&remote_command_str);
make_remote_repmgr_path(&remote_command_str);
appendPQExpBuffer(&remote_command_str,
"node rejoin --upstream-conninfo='%s'",
local_node_record.conninfo);
appendPQExpBuffer(&remote_command_str,
" --config-files=");
for (cell = remote_config_files.head; cell; cell = cell->next)
{
if (first_entry == false)
appendPQExpBuffer(&remote_command_str, ",");
else
first_entry = false;
appendPQExpBuffer(&remote_command_str, "%s", cell->key);
}
log_debug("executing:\n \"%s\"", remote_command_str.data);
(void)remote_command(
remote_host,
runtime_options.remote_user,
remote_command_str.data,
NULL);
termPQExpBuffer(&remote_command_str);
}
else
{
/*
* Execute `repmgr standby follow` to create recovery.conf and start
* the remote server
*
* XXX replace with "node rejoin"
*/
initPQExpBuffer(&remote_command_str);
make_remote_repmgr_path(&remote_command_str);
appendPQExpBuffer(&remote_command_str,
" -d \\'%s\\' standby follow",
local_node_record.conninfo);
log_debug("executing:\n \"%s\"", remote_command_str.data);
(void)remote_command(
remote_host,
runtime_options.remote_user,
remote_command_str.data,
NULL);
/*
* Execute `repmgr standby follow` to create recovery.conf and start
* the remote server
*
* XXX replace with "node rejoin"
*/
initPQExpBuffer(&remote_command_str);
make_remote_repmgr_path(&remote_command_str);
appendPQExpBuffer(&remote_command_str,
" -d \\'%s\\' standby follow",
local_node_record.conninfo);
log_debug("executing:\n \"%s\"", remote_command_str.data);
(void)remote_command(
remote_host,
runtime_options.remote_user,
remote_command_str.data,
NULL);
termPQExpBuffer(&remote_command_str);
termPQExpBuffer(&remote_command_str);
}
/* TODO: verify this node's record was updated correctly */