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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3473) A single task tracker failure shouldn't result in Job failure
Date Thu, 22 Dec 2011 09:04:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174704#comment-13174704
] 

Eli Collins commented on MAPREDUCE-3473:
----------------------------------------

MAPREDUCE-2960 contains details for a specific example. I think what's going on is that the
ability to tolerate disk failures now means you can get a set of task attempt failures on
a single TT that would have just been one (because the TT used to stop itself when it saw
a disk failure).
                
> A single task tracker failure shouldn't result in Job failure 
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-3473
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3473
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: tasktracker
>    Affects Versions: 0.20.205.0, 0.23.0
>            Reporter: Eli Collins
>
> Currently some task failures may result in job failures. Eg a local TT disk failure seen
in TaskLauncher#run, TaskRunner#run, MapTask#run is visible to and can hang the JobClient,
causing the job to fail. Job execution should always be able to survive a task failure if
there are sufficient resources. 

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