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Posted to mapreduce-issues@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2011/02/14 19:21:58 UTC
[jira] Commented: (MAPREDUCE-2324) Job should fail if a reduce task
can't be scheduled anywhere
[ https://issues.apache.org/jira/browse/MAPREDUCE-2324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12994404#comment-12994404 ]
Allen Wittenauer commented on MAPREDUCE-2324:
---------------------------------------------
We just hit this a few weeks ago. Thanks for filing a bug, because I forgot to do it. :)
> 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
> Reporter: Todd Lipcon
>
> 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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