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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3981) Need a distributed file checksum algorithm for HDFS
Date Sat, 15 Aug 2009 12:38:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12743698#action_12743698
] 

Hudson commented on HADOOP-3981:
--------------------------------

Integrated in Hadoop-Common-trunk #55 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-Common-trunk/55/])
    Delete the empty file src/core/org/apache/hadoop/fs/LengthFileChecksum.java which was
removed by .


> Need a distributed file checksum algorithm for HDFS
> ---------------------------------------------------
>
>                 Key: HADOOP-3981
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3981
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.19.0
>
>         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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