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https://issues.apache.org/jira/browse/MAPREDUCE-2761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13076124#comment-13076124
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Ravi Gummadi commented on MAPREDUCE-2761:
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The NPE issue on linux shown in previous comment is observed in trunk.
> New TaskController code doesn't run on Windows
> ----------------------------------------------
>
> Key: MAPREDUCE-2761
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2761
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task-controller, tasktracker
> Affects Versions: 0.20.204.0, 0.23.0
> Reporter: Todd Lipcon
>
> After MAPREDUCE-2178, TaskController assumes that pids are always available.
> The shell executor object that's used to launch a JVM isn't retained, but
> rather the pid is set when the task heartbeats. On Windows, there are no
> pids, and since the ShellCommandExecutor object is no longer around, we can't
> call process.destroy(). So, the TaskController doesn't work on Cygwin anymore.
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