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Date: Fri, 12 Sep 2008 17:35:44 -0700 (PDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-3981) Need a distributed file checksum
 algorithm for HDFS
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    [ https://issues.apache.org/jira/browse/HADOOP-3981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12630719#action_12630719 ] 

Tsz Wo (Nicholas), SZE commented on HADOOP-3981:
------------------------------------------------

In case that Hudson is not working, here is the ant test-patch results:
{noformat}
     [exec] +1 overall.  

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

     [exec]     +1 tests included.  The patch appears to include 6 new or modified tests.

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

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

     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
{noformat}

> Need a distributed file checksum algorithm for HDFS
> ---------------------------------------------------
>
>                 Key: HADOOP-3981
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3981
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: 3981_20080909.patch, 3981_20080910.patch, 3981_20080910b.patch, 3981_20080912.patch
>
>
> Traditional message digest algorithms, like MD5, SHA1, etc., require reading the entire input message sequentially in a central location.  HDFS supports large files with multiple tera bytes.  The overhead of reading the entire file is huge. A distributed file checksum algorithm is needed for HDFS.

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