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Posted to mapreduce-issues@hadoop.apache.org by "Luke Lu (JIRA)" <ji...@apache.org> on 2012/12/15 19:24:12 UTC

[jira] [Created] (MAPREDUCE-4881) Task should throw exception and die if its attempt directory already exists

Luke Lu created MAPREDUCE-4881:
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             Summary: Task should throw exception and die if its attempt directory already exists
                 Key: MAPREDUCE-4881
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4881
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task
    Affects Versions: 1.1.1, 1.0.4
            Reporter: Luke Lu


While tracking down HADOOP-9051, I noticed that TaskLog can create circular symlinks when a task's attempt directory exists before task initialization, which usually indicate a restart bug in JobTracker, as attempt id should be unique. Task should throw an exception, log it and die in this case. 

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