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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7230) Add rolling downgrade documentation
Date Fri, 31 Oct 2014 11:42:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14191717#comment-14191717
] 

Hudson commented on HDFS-7230:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #729 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/729/])
HDFS-7230. Add rolling downgrade documentation. Contributed by Tsz Wo Nicholas Sze. (jing9:
rev b811212f23d25f47e4a15a0fcfb534d698a68e3b)
* hadoop-hdfs-project/hadoop-hdfs/src/site/xdoc/HdfsRollingUpgrade.xml
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Add rolling downgrade documentation
> -----------------------------------
>
>                 Key: HDFS-7230
>                 URL: https://issues.apache.org/jira/browse/HDFS-7230
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 2.4.0
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>             Fix For: 2.6.0
>
>         Attachments: h7230_20141028.patch
>
>
> HDFS-5535 made a lot of improvement on rolling upgrade.  It also added the cluster downgrade
feature.  However, the downgrade described in HDFS-5535 requires cluster downtime.  In this
JIRA, we discuss how to do rolling downgrade, i.e. downgrade without downtime.



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