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  1. Hadoop Map/Reduce
  2. MAPREDUCE-4587

Support fetch by key boundaries for memcmp types

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

    Description

      Intermediate data addressable by key support not only restartable streams, but partitioning after the map output are written. With sampling of map output, a job can implement a total-order and tune the number of reduces around skew. It is possible to implement something similar for non-memcmp types, but it is significantly more complex.

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          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

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              Unassigned Unassigned
              cdouglas Christopher Douglas
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              Dates

                Created:
                Updated: