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  1. Hadoop Map/Reduce
  2. MAPREDUCE-2705

tasks localized and launched serially by TaskLauncher - causing other tasks to be delayed

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.20.205.0
    • Fix Version/s: 0.20.205.0, 0.23.0
    • Component/s: tasktracker
    • Labels:
      None

      Description

      The current TaskLauncher serially launches new tasks one at a time. During the launch it does the localization and then starts the map/reduce task. This can cause any other tasks to be blocked waiting for the current task to be localized and started. In some instances we have seen a task that has a large file to localize (1.2MB) block another task for about 40 minutes. This particular task being blocked was a cleanup task which caused the job to be delayed finishing for the 40 minutes.

        Attachments

        1. MAPREDUCE-2705-branch20.patch
          10 kB
          Thomas Graves
        2. MAPREDUCE-2705-trunk.patch
          9 kB
          Thomas Graves

          Activity

            People

            • Assignee:
              tgraves Thomas Graves
              Reporter:
              tgraves Thomas Graves
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              Dates

              • Created:
                Updated:
                Resolved: