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https://issues.apache.org/jira/browse/YARN-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14524300#comment-14524300
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Wangda Tan commented on YARN-3006:
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+1 for latest patch, committing.
> 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
> 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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