在mysql cluster 测试环境的其中一个节点上（id=4 192.168.1.251）执行 select 操作抱
而在 另外一个节点 192.168.1.252上执行相同的语句是没有问题的。
####192.168.1.251######
标题所示的错误：
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 this 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######
************************分割线******************************************************
####192.168.1.252######
mysql>
mysql> use test
Reading table information for completion of table and column names
You can turn off this 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######
*********************分割线***********************************************************
######192.168.1.244####################
回头去管理节点查看 ，发现管理节点机器挂了。
启动机器
启动服务 ：
[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##########################
解决办法是重启 节点 192.168.1.251sql节点。
[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)
在管理节点中看到的结果如上。