Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-5979

FairScheduler: zero weight can cause sort failures

    Details

    • Type: Bug Bug
    • Status: Resolved
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 1.2.1
    • Fix Version/s: 1.3.0
    • Component/s: scheduler
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      When the weight is set to zero (which is possible with a custom weight adjuster) we can get failures in comparing schedulables.
      This is because when calculating running tasks to weight ratio could result in a 0.0/0.0 which ends up as NaN. Comparisons with NaN are undefined such that (int)Math.signum(NaN - anyNumber) will be 0 causing different criteria to be used in comparison which may not be consistent. This will result in
      IllegalArgumentException: Comparison method violates its general contract!

      1. MAPREDUCE-5979.001.patch
        5 kB
        Anubhav Dhoot
      2. MAPREDUCE-5979.002.patch
        5 kB
        Anubhav Dhoot

        Activity

        Anubhav Dhoot created issue -
        Anubhav Dhoot made changes -
        Field Original Value New Value
        Assignee Anubhav Dhoot [ adhoot ]
        Anubhav Dhoot made changes -
        Status Open [ 1 ] Patch Available [ 10002 ]
        Anubhav Dhoot made changes -
        Attachment MAPREDUCE-5979.001.patch [ 12656394 ]
        Anubhav Dhoot made changes -
        Attachment MAPREDUCE-5979.002.patch [ 12657016 ]
        Karthik Kambatla (Inactive) made changes -
        Summary MR1 FairScheduler zero weight can cause sort failures FairScheduler: zero weight can cause sort failures
        Karthik Kambatla (Inactive) made changes -
        Status Patch Available [ 10002 ] Resolved [ 5 ]
        Hadoop Flags Reviewed [ 10343 ]
        Fix Version/s 1.3.0 [ 12324153 ]
        Resolution Fixed [ 1 ]

          People

          • Assignee:
            Anubhav Dhoot
            Reporter:
            Anubhav Dhoot
          • Votes:
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            Watchers:
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            Dates

            • Created:
              Updated:
              Resolved:

              Development