Support a stop command in ShellCommandExecutor
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Key: HADOOP-7722
URL: https://issues.apache.org/jira/browse/HADOOP-7722
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 0.23.0
Reporter: Hitesh Shah
Priority: Minor
Fix For: 0.23.0
Add a stop function call to Shell so as to either stop the process from getting
started if not already done so or destroy the process if it already has
started.
Context of usage:
There can be race conditions when trying to kill an execution as the
shell::execute call is blocking and using the getProcess call is not a
feasible option as there can be a delay between the execute call and when the
process object is actually created ( after which it can be used to kill the
running sub-process ).
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