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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8432) Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases.
Date Tue, 19 May 2015 17:51:00 GMT
Chris Nauroth created HDFS-8432:
-----------------------------------

             Summary: Introduce a minimum compatible layout version to allow downgrade in
more rolling upgrade use cases.
                 Key: HDFS-8432
                 URL: https://issues.apache.org/jira/browse/HDFS-8432
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode, rolling upgrades
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth


Maintain the prior layout version during the upgrade window and reject attempts to use new
features until after the upgrade has been finalized.  This guarantees that the prior software
version can read the fsimage and edit logs if the administrator decides to downgrade.  This
will make downgrade usable for the majority of NameNode layout version changes, which just
involve introduction of new edit log operations.



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