Error 1296 (HY000): Got error 157 ' Unknown error code ' from Ndbcluster

In a MySQL cluster test environment on one of the nodes (id=4 192.168.1.251) perform a select operation to hold

It is not a problem to execute the same statement on another node 192.168.1.252.

### #192.168.1.251######

Error as shown in caption:

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| Information_schema |
| MySQL |
| Ndbinfo |
| Performance_schema |
| Test |
+--------------------+
5 rows in Set (0.00 sec)

mysql> Use test
Reading table information for completion of table and column names
You can turn off the feature to get a quicker startup with-a

Database changed
Mysql> Show tables;

+----------------+
| Tables_in_test |
+----------------+
| Teacher |
+----------------+
1 row in Set, 1 Warning (6.95 sec)

Mysql> select * from teacher;
Error 1296 (HY000): Got error 157 ' Unknown error code ' from Ndbcluster
Mysql>

### #192.168.1.251######

Split Line ******************************************************

### #192.168.1.252######

Mysql>
mysql> Use test
Reading table information for completion of table and column names
You can turn off the feature to get a quicker startup with-a

Database changed
Mysql> Show tables;
+----------------+
| Tables_in_test |
+----------------+
| Teacher |
+----------------+
1 row in Set (0.00 sec)

Mysql> select * from teacher;
+------+
| t_id |
+------+
| 188 |
+------+

### #192.168.1.252######

Split Line ***********************************************************

##### #192.168.1.244####################

Back to the Management node view, found that the management node machine hung up.

Start the machine

To start the service:

[root@slaver244 ~]# ndb_mgmd-f/app/mysql_cluster/config.ini
MySQL Cluster Management Server mysql-5.5.30 ndb-7.2.12
[root@slaver244 ~]#
[root@slaver244 ~]#
[root@slaver244 ~]# NDB_MGM
--NDB Cluster--Management Client--
Ndb_mgm> Show
Connected to Management Server at:localhost:1186
Cluster Configuration
---------------------
[NDBD (NDB)] 2 node (s)
id=2 @192.168.1.246 (mysql-5.5.30 ndb-7.2.12, nodegroup:0)
Id=3 @192.168.1.250 (mysql-5.5.30 ndb-7.2.12, nodegroup:0, Master)

[NDB_MGMD (MGM)] 1 node (s)
Id=1 @192.168.1.244 (mysql-5.5.30 ndb-7.2.12)

[Mysqld (API)] 2 node (s)
Id=4 (not connected, accepting connect from 192.168.1.251)
Id=5 @192.168.1.252 (mysql-5.5.30 ndb-7.2.12)

Ndb_mgm>
Ndb_mgm>

###### #192.168.1.244##########################

The solution is to restart the node 192.168.1.251sql node.

[Mysqld (API)] 2 node (s)
Id=4 @192.168.1.251 (mysql-5.5.30 ndb-7.2.12)
Id=5 @192.168.1.252 (mysql-5.5.30 ndb-7.2.12)

The results seen in the management node are as above.