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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7443) Add CRC32C as another DataChecksum implementation
Date Wed, 13 Jul 2011 20:05:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064812#comment-13064812
] 

Hudson commented on HADOOP-7443:
--------------------------------

Integrated in Hadoop-Common-trunk-Commit #689 (See [https://builds.apache.org/job/Hadoop-Common-trunk-Commit/689/])
    HADOOP-7443. Add CRC32C as another DataChecksum implementation. Contributed by Todd Lipcon.

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1146300
Files : 
* /hadoop/common/trunk/common/src/test/core/org/apache/hadoop/util/TestPureJavaCrc32.java
* /hadoop/common/trunk/common/CHANGES.txt
* /hadoop/common/trunk/common/src/test/core/org/apache/hadoop/util/TestDataChecksum.java
* /hadoop/common/trunk/common/src/java/org/apache/hadoop/util/DataChecksum.java
* /hadoop/common/trunk/common/src/java/org/apache/hadoop/util/PureJavaCrc32C.java


> 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
>             Fix For: 0.23.0
>
>         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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