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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1351) Want to kill a particular task or attempt
Date Wed, 04 Jul 2007 05:13:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12510063

Arun C Murthy commented on HADOOP-1351:

Enis, with due consideration I'd like to suggest an alternative, simpler approach:

On receipt of {{killTask}} from the user, call {{TaskInProgress.incompleteSubTask}} and mark
the task as {{FAILED}} (and not {{KILLED}} since you want this attempt to count against the

Then hack {{TaskInProgress.shouldCloseForClosedJob}} (I'd suggest rename that to 'shouldTerminate'
or something along those lines...) to return {{true}} for that attempt so as to notify the
TaskTracker on the next heartbeat. (Basically you'll have ensure the {{taskReportedClosed}}
data-structure is maintained correctly i.e. add succesful/failed/killed taskids to this from
{{alreadyCompletedTask}}, {{completedTask}} & {{incompleteSubTask}} ).

> 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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