[jira] Commented: (HADOOP-4391) When killing a streaming task, it should kill the sub processes (subtree) spawned by the task

["Vinod K V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638946#action_12638946 ] 

Vinod K V commented on HADOOP-4391:
-----------------------------------

This can be addressed by introducing job control for tasks (HADOOP-2721). Without which, tracking and killing sub-processes becomes intractable.

> When killing a streaming task, it should kill the sub processes (subtree) spawned by the task 
> ----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4391
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4391
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: contrib/streaming
>            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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