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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-5110) Kill task early in case of long task launch delays
Date Wed, 12 Mar 2014 18:44:44 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla resolved MAPREDUCE-5110.
-----------------------------------------

    Resolution: Won't Fix

Resolving this as "Won't Fix" for inactivity. Please re-open if need be. 

> Kill task early in case of long task launch delays
> --------------------------------------------------
>
>                 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-half-tt-expiry.patch, mr-5110-tt-only.patch,
mr-5110.patch, mr-5110.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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