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When registering a BDR node, sync repmgr.nodes from another node

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If a BDR node is added via bdr_group_join(), repmgr.nodes will
start off empty, so we'll need to sync it ourselves before adding
it to the repmgr replication set.
This commit is contained in:
Ian Barwick
2017-07-12 09:03:15 +09:00
committed by Ian Barwick
parent 1cccb1dd5a
commit 0a1addfdc0
3 changed files with 66 additions and 14 deletions
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27
dbutils.c
View File

@@ -1436,6 +1436,30 @@ void _populate_node_records(PGresult *res, NodeInfoList *node_list)
}
void
get_all_node_records(PGconn *conn, NodeInfoList *node_list)
{
PQExpBufferData query;
PGresult *res;
initPQExpBuffer(&query);
appendPQExpBuffer(&query,
" SELECT node_id, type, upstream_node_id, node_name, conninfo, repluser, slot_name, location, priority, active"
" FROM repmgr.nodes "
"ORDER BY node_id ");
log_verbose(LOG_DEBUG, "get_all_node_records():\n%s", query.data);
res = PQexec(conn, query.data);
termPQExpBuffer(&query);
_populate_node_records(res, node_list);
return;
}
void
get_downstream_node_records(PGconn *conn, int node_id, NodeInfoList *node_list)
{
@@ -2996,7 +3020,8 @@ get_bdr_init_node_record(PGconn *conn, t_bdr_node_info *node_info)
if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
{
//
PQclear(res);
return RECORD_NOT_FOUND;
}
else
{

1
dbutils.h
View File

@@ -240,6 +240,7 @@ t_node_info *get_node_record_pointer(PGconn *conn, int node_id);
bool get_local_node_record(PGconn *conn, int node_id, t_node_info *node_info);
bool get_primary_node_record(PGconn *conn, t_node_info *node_info);
void get_all_node_records(PGconn *conn, NodeInfoList *node_list);
void get_downstream_node_records(PGconn *conn, int node_id, NodeInfoList *nodes);
void get_active_sibling_node_records(PGconn *conn, int node_id, int upstream_node_id, NodeInfoList *node_list);
void get_node_records_by_priority(PGconn *conn, NodeInfoList *node_list);

52
repmgr-action-bdr.c
View File

@@ -87,26 +87,52 @@ do_bdr_register(void)
commit_transaction(conn);
}
// any other BDR nodes - if so connect to one where "node_init_from_dsn" is null,
// and copy repmgr.nodes
// (we'll assume all other nodes are up-to-date)
// don't copy other tables...
/*
* before adding the extension tables to the replication set,
* if any other BDR nodes exist, populate repmgr.nodes with a copy
* of existing entries
*
* currently we won't copy the contents of any other tables
*
*/
{
PGconn *init_node;
RecordStatus bdr_record_status;
t_bdr_node_info bdr_init_node_info = T_BDR_NODE_INFO_INITIALIZER;
NodeInfoList local_node_records = T_NODE_INFO_LIST_INITIALIZER;
get_all_node_records(conn, &local_node_records);
bdr_record_status = get_bdr_init_node_record(conn, &bdr_init_node_info);
if (bdr_record_status == RECORD_FOUND)
if (local_node_records.node_count == 0)
{
/* XXX get all BDR node records */
RecordStatus bdr_record_status;
t_bdr_node_info bdr_init_node_info = T_BDR_NODE_INFO_INITIALIZER;
bdr_record_status = get_bdr_init_node_record(conn, &bdr_init_node_info);
if (bdr_record_status != RECORD_FOUND)
{
/* XXX don't assume the original node will still be part of the cluster */
log_error(_("unable to retrieve record for originating node"));
PQfinish(conn);
exit(ERR_BAD_CONFIG);
}
if (strncmp(node_info.node_name, bdr_init_node_info.node_name, MAXLEN) != 0)
{
init_node = establish_db_connection_quiet(bdr_init_node_info.node_init_from_dsn);
/* */
PGconn *init_node_conn;
NodeInfoList existing_nodes = T_NODE_INFO_LIST_INITIALIZER;
NodeInfoListCell *cell;
init_node_conn = establish_db_connection_quiet(bdr_init_node_info.node_local_dsn);
/* XXX check repmgr schema exists */
get_all_node_records(init_node_conn, &existing_nodes);
for (cell = existing_nodes.head; cell; cell = cell->next)
{
create_node_record(conn, "bdr register", cell->node_info);
}
}
}
}
/* Add the repmgr extension tables to a replication set */