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https://issues.apache.org/jira/browse/HADOOP-2721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665414#action_12665414
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Vinod K V commented on HADOOP-2721:
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bq. For pipes, we still need some work, I propose it to be done in another JIRA 
if nobody else have any objection to this.
Offline, Ravi commented that it can be done in this patch itself. Only one 
minor change is needed for pipes, so.

> Use job control for tasks (and therefore for pipes and streaming)
> -----------------------------------------------------------------
>
>                 Key: HADOOP-2721
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2721
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: contrib/streaming, mapred, pipes
>            Reporter: Owen O'Malley
>            Assignee: Ravi Gummadi
>         Attachments: HADOOP-2721-v10.patch, HADOOP-2721-v2.patch, 
> HADOOP-2721-v3.patch, HADOOP-2721-v9.patch, HADOOP-2721.patch, 
> HADOOP-2721.patch, HADOOP-2721.patch
>
>
> We should use the setsid command when the task is launched to create a new 
> session. We should be able to use the setsid program when we launch the bash 
> process to create a new session. That will allow us to kill the entire 
> session with a single signal and remove the need for the ping methods in both 
> TaskTracker.Child and pipes.

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