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  1. Hadoop Map/Reduce
  2. MAPREDUCE-5962

Support CRC32C in IFile

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Won't Fix
    • Affects Version/s: 2.5.0
    • Fix Version/s: None
    • Component/s: performance, task
    • Labels:
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      Description

      Currently, the IFile format used by the MR shuffle checksums all data using the zlib CRC32 polynomial. If we allow use of CRC32C instead, we can get a large reduction in CPU usage by leveraging the native hardware CRC32C implementation (approx half a second of CPU time savings per GB checksummed).

        Attachments

        1. mapreduce-5962.txt
          14 kB
          Todd Lipcon
        2. mapreduce-5962.txt
          14 kB
          Todd Lipcon

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            • Assignee:
              tlipcon Todd Lipcon
              Reporter:
              tlipcon Todd Lipcon

              Dates

              • Created:
                Updated:
                Resolved:

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