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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9601) Support native CRC on byte arrays
Date Thu, 06 Jun 2013 16:45:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677218#comment-13677218
] 

Hadoop QA commented on HADOOP-9601:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12586526/HADOOP-9601-trunk-rebase.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:red}-1 javac{color:red}.  The patch appears to cause the build to fail.

Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/2611//console

This message is automatically generated.
                
> Support native CRC on byte arrays
> ---------------------------------
>
>                 Key: HADOOP-9601
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9601
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance, util
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>            Assignee: Gopal V
>              Labels: perfomance
>         Attachments: HADOOP-9601-trunk-rebase.patch, HADOOP-9601-WIP-01.patch, HADOOP-9601-WIP-02.patch
>
>
> When we first implemented the Native CRC code, we only did so for direct byte buffers,
because these correspond directly to native heap memory and thus make it easy to access via
JNI. We'd generally assumed that accessing byte[] arrays from JNI was not efficient enough,
but now that I know more about JNI I don't think that's true -- we just need to make sure
that the critical sections where we lock the buffers are short.

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