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https://issues.apache.org/jira/browse/HDFS-3278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-3278.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 2.1.0-beta
         Assignee: Todd Lipcon  (was: Sanjay Radia)

These subtasks were completed quite a while back.

> Umbrella Jira for HDFS-HA Phase 2
> ---------------------------------
>
>                 Key: HDFS-3278
>                 URL: https://issues.apache.org/jira/browse/HDFS-3278
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Sanjay Radia
>            Assignee: Todd Lipcon
>             Fix For: 2.1.0-beta
>
>
> HDFS-1623 gives a high level architecture and design for hot automatic 
> failover of the NN. Branch HDFS-1623 was merged into trunk for tactical 
> reasons even though the work for HA was not complete, Branch HDFS-1623 
> contained mechanisms for keeping a standby Hot (ie read from shared journal), 
> dual block reports, fencing of DNs, Zookeeper library for leader election 
> etc. This Umbrella jira covers the remaining work for HA and will link all 
> the jiras for the remaining work. Unlike HDFS-1623 no single branch will be 
> created - work will proceed in parallel branches.



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