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Posted to mapreduce-issues@hadoop.apache.org by "James Thomas (JIRA)" <ji...@apache.org> on 2014/07/08 20:02:05 UTC

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

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Thomas reassigned MAPREDUCE-5962:
---------------------------------------

    Assignee: James Thomas

> 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: James Thomas
>
> 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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