When killing a streaming task, it should kill the sub processes (subtree)
spawned by the task
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Key: HADOOP-4391
URL: https://issues.apache.org/jira/browse/HADOOP-4391
Project: Hadoop Core
Issue Type: Bug
Reporter: Runping Qi
Many times we saw sub processes left still running after a streaming task is
killed.
This is one kind of resource leakage.
The framework should kill the whole subprocess tree when killing a task.
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