[jira] [Resolved] (HBASE-26550) Make sure the master is running normally before accepting a balance command

["Duo Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-26550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Duo Zhang resolved HBASE-26550.
-------------------------------
    Fix Version/s: 2.5.0
                   2.6.0
     Hadoop Flags: Reviewed
       Resolution: Fixed

Pushed to branch-2.5+.

Thanks [~elserj]!

> Make sure the master is running normally before accepting a balance command
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-26550
>                 URL: https://issues.apache.org/jira/browse/HBASE-26550
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer, master
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Minor
>             Fix For: 2.5.0, 2.6.0, 3.0.0-alpha-3
>
>
> Noticed this in a unit test from [https://github.com/apache/hbase/pull/3851]
> I believe this is a result of the new balance() implementation in the Master, and a client submitting a request to the master before it's completed its instantiation. Simple fix to avoid the NPE.
> {noformat}
> Failed after attempts=2, exceptions:
> 2021-12-07T18:14:19.203Z, java.io.IOException: java.io.IOException
> 	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:461)
> 	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:138)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:354)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:334)
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.master.HMaster.getProcedures(HMaster.java:3335)
> 	at org.apache.hadoop.hbase.master.ServerManager.areDeadServersInProgress(ServerManager.java:505)
> 	at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1886)
> 	at org.apache.hadoop.hbase.master.MasterRpcServices.balance(MasterRpcServices.java:740)
> 	at org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java)
> 	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:393)
> 	... 3 more {noformat}



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