CHANGE DRAINER

CHANGE DRAINER 语句用于修改集群中 Drainer 的状态信息。

示例

SHOW DRAINER STATUS;
+----------|----------------|--------|--------------------|---------------------| | NodeID | Address | State | Max_Commit_Ts | Update_Time | +----------|----------------|--------|--------------------|---------------------| | drainer1 | 127.0.0.3:8249 | Online | 408553768673342532 | 2019-04-30 00:00:03 | +----------|----------------|--------|--------------------|---------------------| | drainer2 | 127.0.0.4:8249 | Online | 408553768673345531 | 2019-05-01 00:00:04 | +----------|----------------|--------|--------------------|---------------------| 2 rows in set (0.00 sec)

可以看出 drainer1 已经超过一天没有更新状态,该 Drainer 处于异常状态,但是 State 仍然为 Online,使用 CHANGE DRAINER 将该 Drainer 状态修改为 paused

CHANGE DRAINER TO NODE_STATE ='paused' FOR NODE_ID 'drainer1';
Query OK, 0 rows affected (0.01 sec)
SHOW DRAINER STATUS;
+----------|----------------|--------|--------------------|---------------------| | NodeID | Address | State | Max_Commit_Ts | Update_Time | +----------|----------------|--------|--------------------|---------------------| | drainer1 | 127.0.0.3:8249 | Paused | 408553768673342532 | 2019-04-30 00:00:03 | +----------|----------------|--------|--------------------|---------------------| | drainer2 | 127.0.0.4:8249 | Online | 408553768673345531 | 2019-05-01 00:00:04 | +----------|----------------|--------|--------------------|---------------------| 2 rows in set (0.00 sec)

MySQL 兼容性

该语句是 TiDB 对 MySQL 语法的扩展。

另请参阅