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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2324) Job should fail if a reduce task can't be scheduled anywhere
Date Mon, 01 Aug 2011 22:00:51 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13073816#comment-13073816
] 

Robert Joseph Evans commented on MAPREDUCE-2324:
------------------------------------------------

+1 that should be enough to unblock us on the sustaining release.  And we can look at what
the correct thing to do in YARN is.

> Job should fail if a reduce task can't be scheduled anywhere
> ------------------------------------------------------------
>
>                 Key: MAPREDUCE-2324
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2324
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.2, 0.20.205.0
>            Reporter: Todd Lipcon
>            Assignee: Robert Joseph Evans
>             Fix For: 0.20.205.0
>
>         Attachments: MR-2324-security-v1.txt, MR-2324-security-v2.txt, MR-2324-security-v3.patch,
MR-2324-secutiry-just-log-v1.patch
>
>
> If there's a reduce task that needs more disk space than is available on any mapred.local.dir
in the cluster, that task will stay pending forever. For example, we produced this in a QA
cluster by accidentally running terasort with one reducer - since no mapred.local.dir had
1T free, the job remained in pending state for several days. The reason for the "stuck" task
wasn't clear from a user perspective until we looked at the JT logs.
> Probably better to just fail the job if a reduce task goes through all TTs and finds
that there isn't enough space.

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