should dump stacks before timing out task
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                 Key: HADOOP-644
                 URL: http://issues.apache.org/jira/browse/HADOOP-644
             Project: Hadoop
          Issue Type: New Feature
          Components: mapred
            Reporter: Doug Cutting


When a task process times out and is killed it is often difficult to determine 
why.  If its stack was dumped prior to killing it, then debugging would be 
vastly simplified.  Ideally the stack dump would be available through the web 
ui, but even the log would be sufficient.

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