Uploaded image for project: 'Hadoop Map/Reduce'
  1. Hadoop Map/Reduce
  2. MAPREDUCE-4589

MapTask preemption

    XMLWordPrintableJSON

Details

    • Improvement
    • Status: Open
    • Major
    • Resolution: Unresolved
    • None
    • None
    • task
    • None

    Description

      For many input types, it is possible to restore the state of a RecordReader by writing a new split for the remaining data (e.g., storing the inflater state with a file offset for gzip text). Similarly, an InputFormat may be capable of further subdividing an InputSplit into smaller tasks to be completed in parallel.

      Since some splits are semantically significant, whether a MapTask can be preempted in this way is not necessarily a property of the InputFormat, only. Minimally, we should allow the user to disable this capability.

      Attachments

        Issue Links

          is part of

          New Feature - A new feature of the product, which has yet to be developed. MAPREDUCE-4584 Umbrella: Preemption and restart of MapReduce tasks

          • Major - Major loss of function.
          • Open

          Activity

            People

              Unassigned Unassigned
              cdouglas Christopher Douglas
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

                Created:
                Updated: