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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7443) Add CRC32C as another DataChecksum implementation
Date Wed, 13 Jul 2011 16:32:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064678#comment-13064678
] 

Hadoop QA commented on HADOOP-7443:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12486255/hadoop-7443.txt
  against trunk revision 1146111.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 7 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/725//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HADOOP-Build/725//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/725//console

This message is automatically generated.

> 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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