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

["Hemanth Yamijala (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hemanth Yamijala updated MAPREDUCE-270:
---------------------------------------

    Release Note: Introduced an option to allow tasktrackers to send an out of band heartbeat on task-completion to improve job latency. A new configuration option mapreduce.tasktracker.outofband.heartbeat is defined, which can be enabled to send this heartbeat.

> 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
>    Affects Versions: 0.21.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-270.patch, MAPREDUCE-270.patch, MAPREDUCE-270.patch, MAPREDUCE-270.patch, MAPREDUCE-270.patch, MAPREDUCE-270_yhadoop20.patch, MAPREDUCE-270_yhadoop20.patch, MAPREDUCE-270_yhadoop20.patch, MAPREDUCE-270_yhadoop20.patch, MAPREDUCE-270_yhadoop20.patch
>
>
> 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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