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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1351) Want to kill a particular task or attempt
Date Wed, 04 Jul 2007 06:30:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510079
] 

Enis Soztutar commented on HADOOP-1351:
---------------------------------------

Thanks Arun for the suggestion, 
> mark the task as FAILED (and not KILLED since you want this attempt to count against
the job).
Actually i think, we should label the task as KILLED, rather than FAILED, since killing is
a task is quite an explicit action done by the user examining the system so she may prefer
seeing the task as KILLED (Although in the similar case for killing jobs we do not have KILLED
status for a job, so killed jobs appear as FAILED). Also, regarding our use cases, we do not
want to "black label" the machine for killed task ({{machinesWhereFailed}}), that's why i
have written {{taskKilled}} instead of using {{incompleteSubTask}}. 

I will look deeper into using {{TaskInProgress.shouldCloseForClosedJob }} and {{tasksReportedClosed}}.
I bet having a generic DFA implementation will benefit us in this. 

> Want to kill a particular task or attempt
> -----------------------------------------
>
>                 Key: HADOOP-1351
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1351
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.12.3
>            Reporter: Owen O'Malley
>            Assignee: Enis Soztutar
>             Fix For: 0.14.0
>
>         Attachments: killTask_v1.0.1.patch
>
>
> It would be convenient to be able to kill a particular task or attempt from the command
line. It would look like:
> bin/hadoop job -kill-task tip_0001_m_000000
> bin/hadoop job -kill-attempt task_0001_m_000000_0
> This would allow the user to tell the system to stop a particular task or attempt without
having to restart a task tracker.

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