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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7443) Add CRC32C as another DataChecksum implementation
Date Wed, 13 Jul 2011 16:19:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HADOOP-7443:
--------------------------------

    Status: Patch Available  (was: Open)

(will commit after Hudson +1s, that is)

> Add CRC32C as another DataChecksum implementation
> -------------------------------------------------
>
>                 Key: HADOOP-7443
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7443
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: io, util
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hadoop-7443.txt, hadoop-7443.txt
>
>
> CRC32C is another checksum very similar to our existing CRC32, but with a different polynomial.
The chief advantage of this other polynomial is that SSE4.2 includes hardware support for
its calculation. HDFS-2080 is the umbrella JIRA which proposes using this new polynomial to
save substantial amounts of CPU.

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