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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3943) QJM: remove currently unused "md5sum" field.
Date Mon, 17 Sep 2012 21:29:07 GMT
Todd Lipcon created HDFS-3943:

             Summary: 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

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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