Hadoop Map/Reduce
  1. Hadoop Map/Reduce
  2. MAPREDUCE-4819

AM can rerun job after reporting final job status to the client


    • Type: Bug Bug
    • Status: Closed
    • Priority: Blocker Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.23.3, 2.0.1-alpha
    • Fix Version/s: 2.0.3-alpha, 0.23.6
    • Component/s: mr-am
    • Labels:


      If the AM reports final job status to the client but then crashes before unregistering with the RM then the RM can run another AM attempt. Currently AM re-attempts assume that the previous attempts did not reach a final job state, and that causes the job to rerun (from scratch, if the output format doesn't support recovery).

      Re-running the job when we've already told the client the final status of the job is bad for a number of reasons. If the job failed, it's confusing at best since the client was already told the job failed but the subsequent attempt could succeed. If the job succeeded there could be data loss, as a subsequent job launched by the client tries to consume the job's output as input just as the re-attempt starts removing output files in preparation for the output commit.

      1. MR-4819-4832.txt
        100 kB
        Robert Joseph Evans
      2. MR-4819-bobby-trunk.txt
        98 kB
        Robert Joseph Evans
      3. MR-4819-bobby-trunk.txt
        95 kB
        Robert Joseph Evans
      4. MR-4819-bobby-trunk.txt
        95 kB
        Robert Joseph Evans
      5. MR-4819-bobby-trunk.txt
        92 kB
        Robert Joseph Evans
      6. MR-4819-bobby-trunk.txt
        86 kB
        Robert Joseph Evans
      7. MR-4819-bobby-trunk.txt
        47 kB
        Robert Joseph Evans
      8. MAPREDUCE-4819.3.patch
        44 kB
        Bikas Saha
      9. MAPREDUCE-4819.2.patch
        35 kB
        Bikas Saha
      10. MAPREDUCE-4819.1.patch
        11 kB
        Bikas Saha

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            • Assignee:
              Bikas Saha
              Jason Lowe
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