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https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039022#comment-13039022
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Sanjay Radia commented on HDFS-1623:
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>Wrt requirement #2, ... fail over to new version of HDFS ... is out of scope
>for this framework.
For failover during upgrades, the DNs need to be able to communicate to both
versions of the NN. This is true for dot releases and will only be true if we
support rolling upgrades. I will clarify this on the next version of the
document.
> High Availability Framework for HDFS NN
> ---------------------------------------
>
> Key: HDFS-1623
> URL: https://issues.apache.org/jira/browse/HDFS-1623
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Attachments: HDFS-High-Availability.pdf, NameNode HA_v2.pdf, Namenode
> HA Framework.pdf
>
>
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