Remove pg_switch_wal()

Author: Arthur Zakirov

src/backup.c

@@ -80,7 +80,6 @@ static void backup_files(void *arg);
 static void do_backup_database(parray *backup_list);
 
 static void pg_start_backup(const char *label, bool smooth, pgBackup *backup);
-static void pg_switch_wal(PGconn *conn);
 static void pg_stop_backup(pgBackup *backup);
 static int checkpoint_timeout(void);
 
@@ -640,15 +639,6 @@ pg_start_backup(const char *label, bool smooth, pgBackup *backup)
 
 	PQclear(res);
 
-	/*
-	 * Switch to a new WAL segment. It is necessary to get archived WAL
-	 * segment, which includes start LSN of current backup.
-	 *
-	 * Do not switch for standby node and if backup is stream.
-	 */
-	if (!stream_wal)
-		pg_switch_wal(conn);
-
 	if (!stream_wal)
 		/*
 		 * Do not wait start_lsn for stream backup.
@@ -662,28 +652,6 @@ pg_start_backup(const char *label, bool smooth, pgBackup *backup)
 		wait_replica_wal_lsn(backup->start_lsn, true);
 }
 
-/*
- * Switch to a new WAL segment. It should be called only for master.
- */
-static void
-pg_switch_wal(PGconn *conn)
-{
-	PGresult   *res;
-
-	/* Remove annoying NOTICE messages generated by backend */
-	res = pgut_execute(conn, "SET client_min_messages = warning;", 0, NULL);
-	PQclear(res);
-
-	if (server_version >= 100000)
-		res = pgut_execute(conn, "SELECT * FROM pg_switch_wal()", 0,
-											  NULL);
-	else
-		res = pgut_execute(conn, "SELECT * FROM pg_switch_xlog()", 0,
-											  NULL);
-
-	PQclear(res);
-}
-
 /*
  * Check if the instance supports ptrack
  * TODO Maybe we should rather check ptrack_version()?