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Posted to mapreduce-dev@hadoop.apache.org by "Devaraj Das (JIRA)" <ji...@apache.org> on 2009/07/07 06:06:15 UTC

[jira] Created: (MAPREDUCE-717) Fix some corner case issues in speculative execution (post hadoop-2141)

Fix some corner case issues in speculative execution (post hadoop-2141)
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                 Key: MAPREDUCE-717
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-717
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: jobtracker
    Affects Versions: 0.21.0
            Reporter: Devaraj Das
            Assignee: Devaraj Das
             Fix For: 0.21.0


Some corner case issues can be fixed:
1) Setup task should not add anything to the job statistics (since they are really fast and might affect the statistics of a job with few tasks)
2) The statistics computations should be guarded for cases where things like sumOfSquares could become less than zero (due to rounding errors mostly).
3) The method TaskInProgress.getCurrentProgressRate() should take into account the COMMIT_PENDING state
4) The testcase TestSpeculativeExecution.testTaskLATEScheduling could be made more robust

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