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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3859) QJM: implement md5sum verification
Date Thu, 30 Aug 2012 16:16:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13445061#comment-13445061
] 

Steve Loughran commented on HDFS-3859:
--------------------------------------

@Todd : this is why a CRC check would be simpler. Faster and less controversial.
                
> QJM: implement md5sum verification
> ----------------------------------
>
>                 Key: HDFS-3859
>                 URL: https://issues.apache.org/jira/browse/HDFS-3859
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3859-sha1.txt
>
>
> When the QJM passes journal segments between nodes, it should use an md5sum field to
make sure the data doesn't get corrupted during transit. This also serves as an extra safe-guard
to make sure that the data is consistent across all nodes when finalizing a segment.

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