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Posted to mapreduce-issues@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2013/04/05 20:21:15 UTC

[jira] [Commented] (MAPREDUCE-5110) Long task launch delays can lead to multiple parallel attempts of the task

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13623893#comment-13623893 ] 

Arun C Murthy commented on MAPREDUCE-5110:
------------------------------------------

[~kkambatl] I haven't heard back, you comfortable with my suggestion that this is not worth additional complexity? Thanks.
                
> Long task launch delays can lead to multiple parallel attempts of the task
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5110
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5110
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 1.1.2
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>         Attachments: expose-mr-5110.patch, mr-5110.patch, mr-5110.patch, mr-5110-tt-only.patch
>
>
> If a task takes too long to launch, the JT expires the task and schedules another attempt. The earlier attempt can start after the later attempt leading to two parallel attempts running at the same time. This is particularly an issue if the user turns off speculation and expects a single attempt of a task to run at any point in time.

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