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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