sidharta seethana created YARN-2653:

             Summary: Support an AM liveness mechanism that works for both 
sync/async AM-RM clients
                 Key: YARN-2653
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: client, resourcemanager
            Reporter: sidharta seethana
            Priority: Minor

Currently, the “heartbeat” mechanism is only supported in the async client ( 
AMRMClientAsyncImpl ). The reason for this seems to be because liveness 
monitoring is currently implemented based on periodic (possibly empty) 
allocation requests - which may return container allocation responses for 
earlier allocation requests. This mechanism only works for the async client 
where allocation responses can be queued and is not application to the 
synchronous/blocking client. 

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