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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3859) QJM: implement md5sum verification
Date Thu, 30 Aug 2012 02:21:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444616#comment-13444616
] 

Andy Isaacson commented on HDFS-3859:
-------------------------------------

I've opened HDFS-3868 as a placeholder for the SHA1 implementation, so that the next time
someone says "we don't have an existing implementation" we have somewhere to go.
                
> 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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