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Make self-referencing foreign key on repl_nodes table deferrable

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This commit is contained in:
Ian Barwick
2016-04-01 15:19:22 +09:00
parent 9a2717b5e3
commit e9445a5d5e
3 changed files with 52 additions and 1 deletions
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20
dbutils.c
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@@ -1127,6 +1127,21 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
begin_transaction(witnessconn);
/* Defer constraints */
sqlquery_snprintf(sqlquery, "SET CONSTRAINTS ALL DEFERRED;");
log_verbose(LOG_DEBUG, "witness_copy_node_records():\n%s\n", sqlquery);
res = PQexec(witnessconn, sqlquery);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_err(_("Unable to defer constraints:\n%s\n"),
PQerrorMessage(witnessconn));
rollback_transaction(witnessconn);
return false;
}
/* Truncate existing records */
sqlquery_snprintf(sqlquery, "TRUNCATE TABLE %s.repl_nodes", get_repmgr_schema_quoted(witnessconn));
log_verbose(LOG_DEBUG, "witness_copy_node_records():\n%s\n", sqlquery);
@@ -1136,9 +1151,12 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
{
log_err(_("Unable to truncate witness servers's repl_nodes table:\n%s\n"),
PQerrorMessage(witnessconn));
rollback_transaction(witnessconn);
return false;
}
/* Get current records from primary */
sqlquery_snprintf(sqlquery,
"SELECT id, type, upstream_node_id, name, conninfo, priority, slot_name, active FROM %s.repl_nodes",
get_repmgr_schema_quoted(masterconn));
@@ -1156,6 +1174,7 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
return false;
}
/* Insert primary records into witness table */
for (i = 0; i < PQntuples(res); i++)
{
bool node_record_created;
@@ -1197,6 +1216,7 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
}
PQclear(res);
/* And finished */
commit_transaction(witnessconn);
return true;

2
repmgr.c
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@@ -4505,7 +4505,7 @@ create_schema(PGconn *conn)
"CREATE TABLE %s.repl_nodes ( "
" id INTEGER PRIMARY KEY, "
" type TEXT NOT NULL CHECK (type IN('master','standby','witness')), "
" upstream_node_id INTEGER NULL REFERENCES %s.repl_nodes (id), "
" upstream_node_id INTEGER NULL REFERENCES %s.repl_nodes (id) DEFERRABLE, "
" cluster TEXT NOT NULL, "
" name TEXT NOT NULL, "
" conninfo TEXT NOT NULL, "

31
sql/repmgr3.1.1_repmgr3.1.2.sql Normal file
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@@ -0,0 +1,31 @@
/*
* Update a repmgr 3.1.1 installation to repmgr 3.1.2
* --------------------------------------------------
*
* This update is only required if repmgrd is being used in conjunction
* with a witness server.
*
* The new repmgr package should be installed first. Then
* carry out these steps:
*
* 1. (If repmgrd is used) stop any running repmgrd instances
* 2. On the master node, execute the SQL statement listed below
* 3. (If repmgrd is used) restart repmgrd
*/
/*
* If your repmgr installation is not included in your repmgr
* user's search path, please set the search path to the name
* of the repmgr schema to ensure objects are installed in
* the correct location.
*
* The repmgr schema is "repmgr_" + the cluster name defined in
* 'repmgr.conf'.
*/
-- SET search_path TO 'name_of_repmgr_schema';
BEGIN;
ALTER TABLE repl_nodes ALTER CONSTRAINT repl_nodes_upstream_node_id_fkey DEFERRABLE;
COMMIT;