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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-3943) QJM: remove currently unused "md5sum" field.
Date Mon, 17 Sep 2012 21:53:08 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-3943.
-------------------------------

       Resolution: Fixed
    Fix Version/s: QuorumJournalManager (HDFS-3077)
     Hadoop Flags: Reviewed

Committed to branch, thx.
                
> QJM: remove currently unused "md5sum" field.
> --------------------------------------------
>
>                 Key: HDFS-3943
>                 URL: https://issues.apache.org/jira/browse/HDFS-3943
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: QuorumJournalManager (HDFS-3077)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: QuorumJournalManager (HDFS-3077)
>
>         Attachments: hdfs-3943.txt
>
>
> Per later discussion in HDFS-3859, it turns out to be rather difficult to integrate md5sum
verification into QJM at this point. The crux of the issue is that different replicas may
be semantically identical, but bytewise unequal due to the padding at the end of the file.
> Given this, I'd like to temporarily remove the "md5sum" field from the protocol while
we work on the more complex verification (which ignores the trailing padding) in HDFS-3859.

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