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Posted to mapreduce-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2014/07/07 18:58:33 UTC

[jira] [Created] (MAPREDUCE-5962) Support CRC32C in IFile

Todd Lipcon created MAPREDUCE-5962:
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             Summary: Support CRC32C in IFile
                 Key: MAPREDUCE-5962
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5962
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: performance, task
    Affects Versions: 2.5.0
            Reporter: Todd Lipcon


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).



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