[jira] Updated: (HADOOP-3981) Need a distributed file checksum algorithm for HDFS

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-3981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HADOOP-3981:
-------------------------------------------

    Attachment: 3981_20080909.patch

3981_20080909.patch: implement MD5-of-xxxMD5-of-yyyCRC, where xxx is crc per block and yyy is bytes per crc.  Need to fix some bugs.

> 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
>         Attachments: 3981_20080909.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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