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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5223) Allow edit log/fsimage format changes without changing layout version
Date Wed, 18 Sep 2013 18:23:53 GMT
Aaron T. Myers created HDFS-5223:
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             Summary: Allow edit log/fsimage format changes without changing layout version
                 Key: HDFS-5223
                 URL: https://issues.apache.org/jira/browse/HDFS-5223
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.1.1-beta
            Reporter: Aaron T. Myers


Currently all HDFS on-disk formats are version by the single layout version. This means that
even for changes which might be backward compatible, like the addition of a new edit log op
code, we must go through the full `namenode -upgrade' process which requires coordination
with DNs, etc. HDFS should support a lighter weight alternative.

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