hadoop服务器中断,Hadoop\Hbase服务器宕机重启报错解决

.md

夜间跳闸服务器宕机，重启Hadoop、Hbase出现的问题及解决方法。


问题描述：

Hbase没有启用负载平衡器

```

The Load Balancer is not enabled which will eventually cause performance degradation in HBase as Regions will not be distributed across all RegionServers. The balancer is only expected to be disabled during rolling upgrade scenarios.

```

解决方法：

在HBase shell中执行，balance_switch true 启动平衡器，再次查看HBase Web UI，看警告是否消失。

可能出现的情况：

```

hbase(main):001:0> balance_switch true

ERROR: org.apache.hadoop.hbase.ipc.ServerNotRunningYetException: Server is not running yet

at org.apache.hadoop.hbase.master.HMaster.checkServiceStarted(HMaster.java:2408)

at org.apache.hadoop.hbase.master.MasterRpcServices.isMasterRunning(MasterRpcServices.java: