dump the threads stack trace to stdout before killing a Task in timeout
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Key: MAPREDUCE-4121
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4121
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: Julien Le Dem
Typically when a job fails because of tasks timing out we investigate the issue
by running the job again and triggering a dump of the thread stack traces of
one of the tasks with jstack/"kill -3" before it times out.
It would be convenient if the Task tracker could do the same right before
killing tasks in time out. This usually points at the offending code.
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