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https://issues.apache.org/jira/browse/MAPREDUCE-5962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved MAPREDUCE-5962.
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Resolution: Won't Fix
> 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
> Assignee: Todd Lipcon
> Priority: Major
> Attachments: mapreduce-5962.txt, mapreduce-5962.txt
>
>
> 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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