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NDB 集群内部结构
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2.83 DUMP 2600

代码

2600

符号

CmvmiDumpConnections

内核块

CMVMI

描述。 显示所有集群节点之间连接的状态。当集群正常运行时,每个连接都具有相同的状态。

示例输出。

Node 3: Connection to 1 (MGM) is connected
Node 3: Connection to 2 (MGM) is trying to connect
Node 3: Connection to 3 (DB) does nothing
Node 3: Connection to 4 (DB) is connected
Node 3: Connection to 7 (API) is connected
Node 3: Connection to 8 (API) is connected
Node 3: Connection to 9 (API) is trying to connect
Node 3: Connection to 10 (API) is trying to connect
Node 3: Connection to 11 (API) is trying to connect
Node 4: Connection to 1 (MGM) is connected
Node 4: Connection to 2 (MGM) is trying to connect
Node 4: Connection to 3 (DB) is connected
Node 4: Connection to 4 (DB) does nothing
Node 4: Connection to 7 (API) is connected
Node 4: Connection to 8 (API) is connected
Node 4: Connection to 9 (API) is trying to connect
Node 4: Connection to 10 (API) is trying to connect
Node 4: Connection to 11 (API) is trying to connect

其他信息。 消息 正在尝试连接 实际上意味着相关节点未启动。当 config.ini 文件中配置的节点中存在未使用的 [api][mysql] 部分时,也就是说,当 API 或 SQL 节点存在备用插槽时,也会出现这种情况。