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https://issues.apache.org/jira/browse/YARN-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14525285#comment-14525285
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Hudson commented on YARN-3006:
------------------------------

SUCCESS: Integrated in Hadoop-Hdfs-trunk #2113 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/2113/])
YARN-3006. Improve the error message when attempting manual failover with 
auto-failover enabled. (Akira AJISAKA via wangda) (wangda: rev 
7d46a806e71de6692cd230e64e7de18a8252019d)
* hadoop-yarn-project/CHANGES.txt
* 
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HAAdmin.java


> Improve the error message when attempting manual failover with auto-failover 
> enabled
> ------------------------------------------------------------------------------------
>
>                 Key: YARN-3006
>                 URL: https://issues.apache.org/jira/browse/YARN-3006
>             Project: Hadoop YARN
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Akira AJISAKA
>            Assignee: Akira AJISAKA
>            Priority: Minor
>             Fix For: 2.8.0, 2.7.1
>
>         Attachments: YARN-3006.001.patch
>
>
> When executing manual failover with automatic failover enabled, 
> UnsupportedOperationException is thrown.
> {code}
> # yarn rmadmin -failover rm1 rm2
> Exception in thread "main" java.lang.UnsupportedOperationException: 
> RMHAServiceTarget doesn't have a corresponding ZKFC address
>       at 
> org.apache.hadoop.yarn.client.RMHAServiceTarget.getZKFCAddress(RMHAServiceTarget.java:51)
>       at 
> org.apache.hadoop.ha.HAServiceTarget.getZKFCProxy(HAServiceTarget.java:94)
>       at 
> org.apache.hadoop.ha.HAAdmin.gracefulFailoverThroughZKFCs(HAAdmin.java:311)
>       at org.apache.hadoop.ha.HAAdmin.failover(HAAdmin.java:282)
>       at org.apache.hadoop.ha.HAAdmin.runCmd(HAAdmin.java:449)
>       at org.apache.hadoop.ha.HAAdmin.run(HAAdmin.java:378)
>       at org.apache.hadoop.yarn.client.cli.RMAdminCLI.run(RMAdminCLI.java:482)
>       at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
>       at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
>       at 
> org.apache.hadoop.yarn.client.cli.RMAdminCLI.main(RMAdminCLI.java:622)
> {code}
> I'm thinking the above message is confusing to users. (Users may think 
> whether ZKFC is configured correctly...) The command should output error 
> message to stderr instead of throwing Exception.



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