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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2324) Job should fail if a reduce task can't be scheduled anywhere
Date Mon, 14 Feb 2011 18:09:57 GMT
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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