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https://issues.apache.org/jira/browse/YARN-5120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15296700#comment-15296700
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Jason Lowe commented on YARN-5120:
----------------------------------

Note there are multiple important dispatchers in the ResourceManager for 
determining health.  The main AsyncDispatcher is one, but the 
SchedulerEventDispatcher is another.  We've seen instances in the past where 
the primary dispatcher was fine and the backlog was all on the scheduler 
dispatcher queue.

> Metric for RM async dispatcher queue size
> -----------------------------------------
>
>                 Key: YARN-5120
>                 URL: https://issues.apache.org/jira/browse/YARN-5120
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Giovanni Matteo Fumarola
>            Priority: Minor
>
> It is difficult to identify the health of the RM AsyncDispatcher. 
> Solution: Add a metric for the AsyncDispatcher queue size. 



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