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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8432) Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases.
Date Sat, 06 Jun 2015 16:53:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Nauroth updated HDFS-8432:
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.8.0
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I have committed this to trunk and branch-2.  Arpit, thank you for the code reviews.

> 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
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8432-HDFS-Downgrade-Extended-Support.pdf, HDFS-8432-branch-2.002.patch,
HDFS-8432-branch-2.003.patch, HDFS-8432.001.patch, HDFS-8432.002.patch
>
>
> 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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