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https://issues.apache.org/jira/browse/YARN-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564285#comment-14564285
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Wilfred Spiegelenburg commented on YARN-3742:
---------------------------------------------
To clarify: the exception thrown is not caught and the exit is follows. In this
case the ZK server had issues and was the root cause of the client connection
failure.
There have been changes in the code recently like YARN-3242 but there is still
a possibility that ZKclient is null which we should handle graceful and just go
to standby.
> YARN RM will shut down if ZKClient creation times out
> -------------------------------------------------------
>
> Key: YARN-3742
> URL: https://issues.apache.org/jira/browse/YARN-3742
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.7.0
> Reporter: Wilfred Spiegelenburg
>
> The RM goes down showing the following stacktrace if the ZK client connection
> fails to be created. We should not exit but transition to StandBy and stop
> doing things and let the other RM take over.
> {code}
> 2015-04-19 01:22:20,513 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Received a
> org.apache.hadoop.yarn.server.resourcemanager.RMFatalEvent of type
> STATE_STORE_OP_FAILED. Cause:
> java.io.IOException: Wait for ZKClient creation timed out
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1066)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1090)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.existsWithRetries(ZKRMStateStore.java:996)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.updateApplicationStateInternal(ZKRMStateStore.java:643)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppTransition.transition(RMStateStore.java:162)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$UpdateAppTransition.transition(RMStateStore.java:147)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$SingleInternalArc.doTransition(StateMachineFactory.java:362)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.doTransition(StateMachineFactory.java:302)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory.access$300(StateMachineFactory.java:46)
> at
> org.apache.hadoop.yarn.state.StateMachineFactory$InternalStateMachine.doTransition(StateMachineFactory.java:448)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.handleStoreEvent(RMStateStore.java:806)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:879)
> at
> org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore$ForwardingEventHandler.handle(RMStateStore.java:874)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:173)
> at
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:106)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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