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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:
      None

      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

          Issue Links

          is related to

          Improvement - An improvement or enhancement to an existing feature or task. HDFS-3528 Use native CRC32 in DFS write path

          • Major - Major loss of function.
          • Closed
          relates to

          Improvement - An improvement or enhancement to an existing feature or task. MAPREDUCE-2841 Task level native optimization

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. HADOOP-10859 Native implementation of java Checksum interface

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

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              People

              • Assignee:
                tlipcon Todd Lipcon
                Reporter:
                tlipcon Todd Lipcon
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                Dates

                • Created:
                  Updated:
                  Resolved: