[jira] Commented: (MAPREDUCE-270) TaskTracker could send an out-of-band heartbeat when the last running map/reduce completes

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758114#action_12758114 ] 

Arun C Murthy commented on MAPREDUCE-270:
-----------------------------------------

We've seen the lack of out-of-band heartbeat cause severe latency issues for some class of small applications. I'd like to use this jira to re-introduce out-of-band heartbeats when configured for completion of any task. Thoughts?

> TaskTracker could send an out-of-band heartbeat when the last running map/reduce completes
> ------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-270
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-270
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>
> Currently the TaskTracker strictly respects the heartbeat interval, this causes utilization issues when all running tasks complete. We could send an out-of-band heartbeat in that case.

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