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Add "standby switchover" mode

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Perform a switchover by:
 - stopping current primary node
 - promoting this standby node to primary
 - forcing previous primary node to follow this node

Caveats:
 - repmgrd must not be running, otherwise it may
   attempt a failover
   (TODO: find some way of notifying repmgrd of planned
    activity like this)
 - currently only set up for two-node operation; any other
   standbys will probably become downstream cascaded standbys
   of the old primary once it's restarted
 - as we're executing repmgr remotely (on the old primary),
   we'll need the location of its configuration file; this
   can be provided explicitly with -C/--remote-config-file,
   otherwise repmgr will look in default locations on the
   remote server
 - this does not yet support "rewinding" stopped nodes
   which will be unable to catch up with the primary

TODO:
 - update help, docs
 - make connection test timeouts/intervals configurable
This commit is contained in:
Ian Barwick
2015-11-25 16:25:15 +09:00
parent f6d1db5edb
commit 120688013e
6 changed files with 1079 additions and 184 deletions
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44
repmgrd.c
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@@ -79,7 +79,6 @@ static void do_master_failover(void);
static bool do_upstream_standby_failover(t_node_info upstream_node);
static t_node_info get_node_info(PGconn *conn, char *cluster, int node_id);
static t_server_type parse_node_type(const char *type);
static XLogRecPtr lsn_to_xlogrecptr(char *lsn, bool *format_ok);
/*
@@ -2268,13 +2267,13 @@ check_and_create_pid_file(const char *pid_file)
t_node_info
get_node_info(PGconn *conn, char *cluster, int node_id)
{
PGresult *res;
int res;
t_node_info node_info = T_NODE_INFO_INITIALIZER;
res = get_node_record(conn, cluster, node_id);
res = get_node_record(conn, cluster, node_id, &node_info);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
if (res == -1)
{
PQExpBufferData errmsg;
initPQExpBuffer(&errmsg);
@@ -2293,47 +2292,16 @@ get_node_info(PGconn *conn, char *cluster, int node_id)
false,
errmsg.data);
PQclear(res);
PQfinish(conn);
terminate(ERR_DB_QUERY);
}
if (!PQntuples(res)) {
if (res == 0)
{
log_warning(_("No record found record for node %i\n"), node_id);
PQclear(res);
node_info.node_id = NODE_NOT_FOUND;
return node_info;
}
node_info.node_id = atoi(PQgetvalue(res, 0, 0));
node_info.upstream_node_id = atoi(PQgetvalue(res, 0, 1));
strncpy(node_info.conninfo_str, PQgetvalue(res, 0, 2), MAXLEN);
node_info.type = parse_node_type(PQgetvalue(res, 0, 3));
strncpy(node_info.slot_name, PQgetvalue(res, 0, 4), MAXLEN);
node_info.active = (strcmp(PQgetvalue(res, 0, 5), "t") == 0)
? true
: false;
PQclear(res);
return node_info;
}
static t_server_type
parse_node_type(const char *type)
{
if (strcmp(type, "master") == 0)
{
return MASTER;
}
else if (strcmp(type, "standby") == 0)
{
return STANDBY;
}
else if (strcmp(type, "witness") == 0)
{
return WITNESS;
}
return UNKNOWN;
}