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From "Vinod Kumar Vavilapalli (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4089) Hung Tasks never time out.
Date Mon, 02 Apr 2012 20:15:24 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244541#comment-13244541
] 

Vinod Kumar Vavilapalli commented on MAPREDUCE-4089:
----------------------------------------------------

Not sure we can do anything else if we want to be compatible in this sense. Removing the ping
thread completely from the framework is one option, but may be later.
                
> Hung Tasks never time out. 
> ---------------------------
>
>                 Key: MAPREDUCE-4089
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4089
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.2, 2.0.0, trunk
>            Reporter: Robert Joseph Evans
>            Assignee: Robert Joseph Evans
>            Priority: Blocker
>         Attachments: MR-4089.txt, MR-4089.txt, MR-4089.txt, MR-4089.txt, MR-4089.txt
>
>
> The AM will timeout a task through mapreduce.task.timeout only when it does not hear
from the task within the given timeframe.  On 1.0 a task must be making progress, either by
reading input from HDFS, writing output to HDFS, writing to a log, or calling a special method
to inform it that it is still making progress.
> This is because on 0.23 a status update which happens every 3 seconds is counted as progress.

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