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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4817) Hardcoded task ping timeout kills tasks localizing large amounts of data
Date Mon, 26 Nov 2012 20:56:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13504080#comment-13504080
] 

Thomas Graves commented on MAPREDUCE-4817:
------------------------------------------

This jira will make the ping timeout configurable.  MAPREDUCE-4818 will be for actual fix
to the issue.
                
> Hardcoded task ping timeout kills tasks localizing large amounts of data
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4817
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4817
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: applicationmaster, mr-am
>    Affects Versions: 0.23.3, 2.0.3-alpha
>            Reporter: Jason Lowe
>            Assignee: Thomas Graves
>            Priority: Critical
>
> When a task is launched and spends more than 5 minutes localizing files, the AM will
kill the task due to ping timeout.  The AM's TaskHeartbeatHandler currently tracks tasks via
a progress timeout and a ping timeout.  The progress timeout can be controlled via mapreduce.task.timeout
and even disabled by setting the property to 0.  The ping timeout, however, is hardcoded to
5 minutes and cannot be configured.  Therefore if the task takes too long localizing, it never
gets running in order to ping back to the AM and the AM kills it due to ping timeout.

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