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https://issues.apache.org/jira/browse/YARN-4460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058647#comment-15058647
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Varun Saxena commented on YARN-4460:
------------------------------------

Changes LGTM.
Will commit it after jenkins build.

> [Bug fix] RM fails to start when SMP is enabled
> -----------------------------------------------
>
>                 Key: YARN-4460
>                 URL: https://issues.apache.org/jira/browse/YARN-4460
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>    Affects Versions: YARN-2928
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: YARN-4460-feature-YARN-2928.001.patch
>
>
> When SMP is enabled, the RM starts with the following fatal message: 
> {code}
> FATAL event.AsyncDispatcher (AsyncDispatcher.java:dispatch(189)) - Error in 
> dispatcher thread true
> java.lang.Exception: No handler for registered for class 
> org.apache.hadoop.yarn.server.resourcemanager.metrics.AbstractSystemMetricsPubli
> sher$SystemMetricsEventType
>        at 
> org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:185)
>        at 
> org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:109)
>        at java.lang.Thread.run(Thread.java:745)
> {code}
> We should register event handlers in service init stage in 
> TimelineServiceV2Publisher to fix this problem. 



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