TaskTracker could send an out-of-band heartbeat when the last running 
map/reduce completes
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                 Key: HADOOP-5129
                 URL: https://issues.apache.org/jira/browse/HADOOP-5129
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.20.0
            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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