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https://issues.apache.org/jira/browse/HBASE-23338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16981333#comment-16981333
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Karthik Palanisamy commented on HBASE-23338:
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Let me double-check again. Turns green after service reboot.
> Prevent NPE running rsgroup balancer
> ------------------------------------
>
> Key: HBASE-23338
> URL: https://issues.apache.org/jira/browse/HBASE-23338
> Project: HBase
> Issue Type: Bug
> Components: rsgroup
> Affects Versions: 3.0.0
> Reporter: Karthik Palanisamy
> Assignee: Karthik Palanisamy
> Priority: Major
>
> 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.
> {code:java}
> 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
> {code}
> {code:java}
> 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"'{code}
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