[jira] [Created] (YARN-3006) Improve the error message when attempting manual failover with auto-failover enabled

["Akira AJISAKA (JIRA)" <ji...@apache.org>]

Akira AJISAKA created YARN-3006:
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             Summary: 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


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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