hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8432) Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases.
Date Tue, 19 May 2015 23:24:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8432?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14551443#comment-14551443
] 

Chris Nauroth commented on HDFS-8432:
-------------------------------------

The test failures look unrelated and do not repro locally.  They look like the problem that
was just reported in HDFS-8434.

> 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
>         Attachments: HDFS-8432-HDFS-Downgrade-Extended-Support.pdf, HDFS-8432.001.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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message