Details
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Improvement
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Status: Closed
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Major
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Resolution: Fixed
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0.21.0
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None
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None
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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.
Description
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.