为什么mysql cluster里只能打开2个SQL节点？

hp6325

我的环境：
1台mgm、3台SQL、4台data node

在配置好以后，发现显示只有2个SQL节点是加入集群的，第三台怎么都加不进去，这是顺序启动后的查看结果：
[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   5 node(s)
id=6    @192.168.10.81  (mysql-5.5.22 ndb-7.2.6)
id=7    @192.168.10.82  (mysql-5.5.22 ndb-7.2.6)
id=8 (not connected, accepting connect from 192.168.10.83)
id=9 (not connected, accepting connect from any host)
id=10 (not connected, accepting connect from any host)

可是当我再次查看时，又变成这样了：

[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   5 node(s)
id=6 (not connected, accepting connect from 192.168.10.81)
id=7    @192.168.10.82  (mysql-5.5.22 ndb-7.2.6)
id=8    @192.168.10.83  (mysql-5.5.22 ndb-7.2.6)
id=9 (not connected, accepting connect from any host)
id=10 (not connected, accepting connect from any host)


请问，这是为什么？

hp6325

我又仔细检查了配置，并重新测试，发现一个奇怪的现象：就是每次查看都会不一样，具体现象如下：
每次使用ndb_mgm -e show命令查看时，sql nodes都会不一样，到第四次时又全部显示正常了。
---------------------------------------------------------------------------------------
[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   4 node(s)
id=6 (not connected, accepting connect from 192.168.10.81)
id=7    @192.168.10.82  (mysql-5.5.22 ndb-7.2.6)
id=8    @192.168.10.83  (mysql-5.5.22 ndb-7.2.6)
id=9 (not connected, accepting connect from any host)

----------------------------------------------------------------------------------------
[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   4 node(s)
id=6    @192.168.10.81  (mysql-5.5.22 ndb-7.2.6)
id=7 (not connected, accepting connect from 192.168.10.82)
id=8    @192.168.10.83  (mysql-5.5.22 ndb-7.2.6)
id=9 (not connected, accepting connect from any host)

----------------------------------------------------------------------------------------
[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   4 node(s)
id=6    @192.168.10.81  (mysql-5.5.22 ndb-7.2.6)
id=7    @192.168.10.82  (mysql-5.5.22 ndb-7.2.6)
id=8 (not connected, accepting connect from 192.168.10.83)
id=9 (not connected, accepting connect from any host)

----------------------------------------------------------------------------------------
[root@localhost mysql-cluster]# ndb_mgm -e show
Connected to Management Server at: localhost:1186
Cluster Configuration
---------------------
[ndbd(NDB)]     4 node(s)
id=2    @192.168.10.84  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0, Master)
id=3    @192.168.10.85  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 0)
id=4    @192.168.10.86  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)
id=5    @192.168.10.87  (mysql-5.5.22 ndb-7.2.6, Nodegroup: 1)

[ndb_mgmd(MGM)] 1 node(s)
id=1    @192.168.10.80  (mysql-5.5.22 ndb-7.2.6)

[mysqld(API)]   4 node(s)
id=6    @192.168.10.81  (mysql-5.5.22 ndb-7.2.6)
id=7    @192.168.10.82  (mysql-5.5.22 ndb-7.2.6)
id=8    @192.168.10.83  (mysql-5.5.22 ndb-7.2.6)
id=9 (not connected, accepting connect from any host)