[jira] Commented: (HADOOP-1351) Want to kill a particular task or attempt

["Arun C Murthy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12524473 ] 

Arun C Murthy commented on HADOOP-1351:
---------------------------------------

Sorry, I should have reviewed this earlier... some comments:

1. {{JobTracker.killTask}} should be a *synchronized* method

2. Please don't introduce the string handling functions {{TaskInProgress.extractJobId}} & {{TaskInProgress.extractTIPId}}, they will break soon i.e. after we fix HADOOP-544. 

{noformat}
+    String jobid = TaskInProgress.extractJobId(taskid);
+    String tipid = TaskInProgress.extractTIPId(taskid);
{noformat}

can be:

{noformat}
+   TaskInProgress tip = taskidToTIPMap.get(taskid);
+   String tipId = tip.getTIPId();
+   String jobId = tip.getJob().getStatus().getJobId();
{noformat}


> 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: 0.15.0
>            Reporter: Owen O'Malley
>            Assignee: Enis Soztutar
>             Fix For: 0.15.0
>
>         Attachments: killTask_v1.0.1.patch, killTask_v1.2.patch, killTask_v1.3.patch, killTask_v1.4.patch, killTask_v1.5.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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