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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-957) FSImage layout version should be only once file is complete
Date Tue, 09 Feb 2010 03:57:27 GMT
FSImage layout version should be only once file is complete
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                 Key: HDFS-957
                 URL: https://issues.apache.org/jira/browse/HDFS-957
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon
            Assignee: Todd Lipcon


Right now, the FSImage save code writes the LAYOUT_VERSION at the head of the file, along
with some other headers, and then dumps the directory into the file. Instead, it should write
a special IMAGE_IN_PROGRESS entry for the layout version, dump all of the data, then seek
back to the head of the file to write the proper LAYOUT_VERSION. This would make it very easy
to detect the case where the FSImage save got interrupted.

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