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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1800) Extend image checksumming to function with multiple fsimage files
Date Sat, 02 Apr 2011 15:00:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015036#comment-13015036
] 

stack commented on HDFS-1800:
-----------------------------

Patch looks good so far.  Why you think this 'TODO: upgrade maybe wont work'?  If the md5
file not present (because upgrade), just keep going skipping the md5 check, logging a warn?
 Your code doesn't seem to do this currently.

> Extend image checksumming to function with multiple fsimage files
> -----------------------------------------------------------------
>
>                 Key: HDFS-1800
>                 URL: https://issues.apache.org/jira/browse/HDFS-1800
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>
>         Attachments: hdfs-1800-prelim.txt
>
>
> HDFS-903 added the MD5 checksum of the fsimage to the VERSION file in each image directory.
This allows it to verify that the FSImage didn't get corrupted or accidentally replaced on
disk.
> With HDFS-1073, there may be multiple fsimage_N files in a storage directory corresponding
to different checkpoints. So having a single MD5 in the VERSION file won't suffice. Instead
we need to store an MD5 per image file.

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