[HADOOP-7722] Support a stop command in ShellCommandExecutor

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Later
• Affects Version/s: 0.23.0
• Fix Version/s: 0.23.0
• Tags: mr2,mapreduce-2.0
• Assignee: Hitesh Shah
• Reporter: Hitesh Shah
• Created: 04/Oct/11 20:41
• Updated: 02/May/13 02:29
• Resolved: 27/Oct/11 06:39

Description

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 ).

Issue Links

• is depended upon by: MAPREDUCE-3084 race when KILL_CONTAINER is received for a LOCALIZED container