Akira AJISAKA created YARN-3006:
-----------------------------------
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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