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"node rejoin": verify status of rejoin target

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This adapts the code previously added to "standby follow" to verify
whether the rejoin target can actually be rejoined.
This commit is contained in:
Ian Barwick
2019-01-23 16:59:14 +09:00
parent 3f5762e03a
commit 061932d023
6 changed files with 104 additions and 30 deletions
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75
repmgr-client.c
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@@ -3173,14 +3173,14 @@ drop_replication_slot_if_exists(PGconn *conn, int node_id, char *slot_name)
* can actually be followed.
*/
bool
check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *follow_target_conn, t_node_info *follow_target_node_record)
check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *follow_target_conn, t_node_info *follow_target_node_record, bool is_rejoin)
{
uint64 local_system_identifier = UNKNOWN_SYSTEM_IDENTIFIER;
t_conninfo_param_list follow_target_repl_conninfo = T_CONNINFO_PARAM_LIST_INITIALIZER;
PGconn *follow_target_repl_conn = NULL;
t_system_identification follow_target_identification = T_SYSTEM_IDENTIFICATION_INITIALIZER;
TimeLineHistoryEntry *follow_target_history = NULL;
bool success;
bool success = true;
/* check replication connection */
initialize_conninfo_params(&follow_target_repl_conninfo, false);
@@ -3210,10 +3210,7 @@ check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *fo
}
/* check system_identifiers match */
local_system_identifier = get_system_identifier(config_file_options.data_directory);
success = identify_system(follow_target_repl_conn, &follow_target_identification);
if (success == false)
if (identify_system(follow_target_repl_conn, &follow_target_identification) == false)
{
log_error(_("unable to query the follow target node's system identification"));
@@ -3221,6 +3218,11 @@ check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *fo
return false;
}
local_system_identifier = get_system_identifier(config_file_options.data_directory);
/*
* Check for thing that should never happen, but expect the unexpected anyway.
*/
if (follow_target_identification.system_identifier != local_system_identifier)
{
log_error(_("this node is not part of the follow target node's replication cluster"));
@@ -3230,13 +3232,13 @@ check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *fo
PQfinish(follow_target_repl_conn);
return false;
}
else if (runtime_options.dry_run == true)
if (runtime_options.dry_run == true)
{
log_info(_("local and follow target system identifiers match"));
log_detail(_("system identifier is %lu"), local_system_identifier);
}
/* check timelines */
log_verbose(LOG_DEBUG, "local timeline: %i; follow target timeline: %i",
@@ -3275,12 +3277,21 @@ check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *fo
}
else
{
log_error(_("this node is ahead of the follow target"));
const char *error_msg = _("this node is ahead of the follow target");
if (is_rejoin == true && runtime_options.force_rewind_used == true)
{
log_warning("%s", error_msg);
}
else
{
log_error("%s", error_msg);
success = false;
}
log_detail(_("local node lsn is %X/%X, follow target lsn is %X/%X"),
format_lsn(local_xlogpos),
format_lsn(follow_target_xlogpos));
PQfinish(follow_target_repl_conn);
return false;
}
}
else
@@ -3306,26 +3317,44 @@ check_node_can_attach(TimeLineID local_tli, XLogRecPtr local_xlogpos, PGconn *fo
*/
if (local_xlogpos > follow_target_history->end)
{
log_error(_("this node cannot attach to follow target node %i"),
follow_target_node_record->node_id);
log_detail(_("follow target server's timeline %i forked off current database system timeline %i before current recovery point %X/%X\n"),
if (is_rejoin == true && runtime_options.force_rewind_used == true)
{
log_notice(_("pg_rewind execution required for this node to attach to follow target node %i"),
follow_target_node_record->node_id);
}
else
{
log_error(_("this node cannot attach to follow target node %i"),
follow_target_node_record->node_id);
success = false;
}
log_detail(_("follow target server's timeline %i forked off current database system timeline %i before current recovery point %X/%X"),
local_tli + 1,
local_tli,
format_lsn(local_xlogpos));
return false;
if (is_rejoin == true && runtime_options.force_rewind_used == false)
{
log_hint(_("use --force-rewind to execute pg_rewind"));
}
}
if (runtime_options.dry_run == true)
if (success == true && runtime_options.dry_run == true)
{
log_info(_("local node %i can attach to target node %i"),
config_file_options.node_id,
follow_target_node_record->node_id);
if (is_rejoin == false || (is_rejoin == true && runtime_options.force_rewind_used == false))
{
log_info(_("local node %i can attach to target node %i"),
config_file_options.node_id,
follow_target_node_record->node_id);
log_detail(_("local node's recovery point: %X/%X; follow target node's fork point: %X/%X"),
format_lsn(local_xlogpos),
format_lsn(follow_target_history->end));
log_detail(_("local node's recovery point: %X/%X; follow target node's fork point: %X/%X"),
format_lsn(local_xlogpos),
format_lsn(follow_target_history->end));
}
}
}
return true;
PQfinish(follow_target_repl_conn);
return success;
}