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  1. Hadoop Common
  2. HADOOP-5727

Faster, simpler id.hashCode() which does not allocate memory

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.21.0
    • None
    • None
    • Reviewed

    Description

      Integer.valueOf allocates memory if the integer is not in the object-cache, which is the vast majority of cases for the task id. It is possible to compute the hash code of an integer without going via the integer cache, and hence avoiding allocating memory.

      Attachments

        1. 00_id-noallocate.patch
          0.3 kB
          Shevek
        2. 03_id-noallocate.patch
          0.5 kB
          Shevek
        3. 5727-0.patch
          0.4 kB
          Christopher Douglas

        Issue Links

          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-288 Redundant computation in hashCode() implemenation

          • Major - Major loss of function.
          • Closed

          Activity

            People

              arren Shevek
              arren Shevek
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              Dates

                Created:
                Updated:
                Resolved: