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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3473) Task failures shouldn't result in Job failures
Date Mon, 28 Nov 2011 18:23:40 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158611#comment-13158611
] 

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

The issue is that the single failure can be visible to the client. Eg when the JobClient tries
to get the tasklog from from a particular TT that's failed. The reliability mechanism should
be invisible to the client. See also MAPREDUCE-2960 (A single TT disk failure can cause the
job to fail). To see what I'm talking about run a job in a loop and then fail one of the disks
on one of the TTs, some percentage of the time this single failure on a single TT can cause
the entire job to fail.
                
> Task failures shouldn't result in Job failures 
> -----------------------------------------------
>
>                 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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