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https://issues.apache.org/jira/browse/YARN-3742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981514#comment-15981514
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Daniel Templeton commented on YARN-3742:
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{quote}When creating RMFatalEvent, start the message with capital letters{quote}
I did that on purpose because the {{RMFatalEvent}} will prepend the message
with "RMFatalEvent of type %s, caused by %s". There were some cases where the
message was logged in addition to being passed to the event constructor, and in
those cases I started with a capital.
{quote}Would "Critical thread, %s, exited unexpectedly" be a grammatically
better message?{quote}
Again, prepend "RMFatalEvent of type %s, caused by %s" => "RMFatalEvent of type
%s, caused by a critical thread, %s, that exited unexpectedly".
> 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
> Assignee: Daniel Templeton
> Attachments: YARN-3742.001.patch, YARN-3742.002.patch
>
>
> 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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