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https://issues.apache.org/jira/browse/HDFS-5535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13909668#comment-13909668
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Fengdong Yu commented on HDFS-5535:
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Thanks [~szetszwo], I'll do testing next week. and post here.

> Umbrella jira for improved HDFS rolling upgrades
> ------------------------------------------------
>
>                 Key: HDFS-5535
>                 URL: https://issues.apache.org/jira/browse/HDFS-5535
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: datanode, ha, hdfs-client, namenode
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Nathan Roberts
>         Attachments: HDFSRollingUpgradesHighLevelDesign.pdf, 
> h5535_20140219.patch, h5535_20140220-1554.patch, h5535_20140220b.patch, 
> h5535_20140221-2031.patch
>
>
> In order to roll a new HDFS release through a large cluster quickly and 
> safely, a few enhancements are needed in HDFS. An initial High level design 
> document will be attached to this jira, and sub-jiras will itemize the 
> individual tasks.



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