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https://issues.apache.org/jira/browse/MAPREDUCE-3572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod Kumar Vavilapalli updated MAPREDUCE-3572:
-----------------------------------------------

          Component/s: mr-am
          Description: 
All the heartbeat processing is done in {{RMContainerAllocator}} locking the 
object. The event processing is also locked on this, causing the dispatcher to 
be blocked and the rest of the AM getting stalled.

The event processing should be in a separate thread.
    Affects Version/s: 0.23.0
        Fix Version/s: 0.23.1
    
> MR AM's dispatcher is blocked by heartbeats to ResourceManager
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-3572
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3572
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mr-am, mrv2, performance
>    Affects Versions: 0.23.0
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>             Fix For: 0.23.1
>
>
> All the heartbeat processing is done in {{RMContainerAllocator}} locking the 
> object. The event processing is also locked on this, causing the dispatcher 
> to be blocked and the rest of the AM getting stalled.
> The event processing should be in a separate thread.

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