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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7302) namenode -rollingUpgrade downgrade may finalize a rolling upgrade
Date Tue, 28 Oct 2014 20:12:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187373#comment-14187373
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Tsz Wo Nicholas Sze commented on HDFS-7302:
-------------------------------------------

Downgrade actually can be done in a rolling fashion as shown in HDFS-7230.  So the "-rollingUpgrade
downgrade" startup option is indeed not very useful.  I suggest removing it.

> namenode -rollingUpgrade downgrade may finalize a rolling upgrade
> -----------------------------------------------------------------
>
>                 Key: HDFS-7302
>                 URL: https://issues.apache.org/jira/browse/HDFS-7302
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>
> The namenode startup option "-rollingUpgrade downgrade" is originally designed for downgrading
cluster.  However, running "namenode -rollingUpgrade downgrade" with the new software could
result in finalizing the ongoing rolling upgrade.



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