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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3859) QJM: implement md5sum verification
Date Mon, 17 Sep 2012 19:30:08 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457247#comment-13457247
] 

Todd Lipcon commented on HDFS-3859:
-----------------------------------

Actually this isn't committable yet. Before committing I ran it through the randomized fault
tests and found some issues -- mostly around the fact that two log segments may be semantically
equivalent but their md5sums may differ (due to the padding at the end of the file after the
transactions). It's looking like working around this is going to be somewhat difficult...
so I may just remove the md5sum field for now until we have some better way of handling this.
                
> 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, hdfs-3859.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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