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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5473) Race condition in command-line kill for a task
Date Mon, 30 Mar 2009 09:46:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693706#action_12693706
] 

Amareshwari Sriramadasu commented on HADOOP-5473:
-------------------------------------------------

Contrib-test failure is not related to the patch. 

> Race condition in command-line kill for a task
> ----------------------------------------------
>
>                 Key: HADOOP-5473
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5473
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.19.2
>
>         Attachments: patch-5473-1.txt, patch-5473-2.txt
>
>
> The race condition occurs in following sequence of events:
> 1. User issues a command-line kill for a RUNNING map-task. JT stores the task in tasksToKill
mapping.
> 2. TT reports the task status as SUCCEEDED.
> 3. JT creates a TaskCompletionEvent as SUCCEEDED. Also sends a killTaskAction.
> 4. Reducers fail fetching the map output.
> 5. finally, the task would fail with Fetch failures. After HADOOP-4759, the task is left
as FAILED_UNCLEAN task, since the task is present in tasksToKill mapping.

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