karthikhw opened a new pull request #876: HBASE-23338 Prevent NPE running rsgroup balancer URL: https://github.com/apache/hbase/pull/876 I think we should prevent NPE even if user trigger balancer on rsgroup that contains only a single regionserver. Sometimes users trigger balancer on all groups even without knowing group info. master log ``` 2019-11-24 22:50:29,868 ERROR [RpcServer.default.FPBQ.Fifo.handler=22,queue=1,port=16000] ipc.RpcServer: Unexpected throwable object java.lang.NullPointerException ``` Shell ``` hbase(main):002:0> balance_rsgroup 'shva' ERROR: java.io.IOException at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:433) at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:133) at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:338) at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:318)Caused by: java.lang.NullPointerException For usage try 'help "balance_rsgroup"' ```
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