Chao Sun commented on HDFS-6440:

Would love to see this feature in branch-2. How much work is involved to merge 

> Support more than 2 NameNodes
> -----------------------------
>                 Key: HDFS-6440
>                 URL: https://issues.apache.org/jira/browse/HDFS-6440
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: auto-failover, ha, namenode
>    Affects Versions: 2.4.0
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>             Fix For: 3.0.0-alpha1
>         Attachments: hdfs-6440-cdh-4.5-full.patch, hdfs-6440-trunk-v1.patch, 
> hdfs-6440-trunk-v1.patch, hdfs-6440-trunk-v3.patch, hdfs-6440-trunk-v4.patch, 
> hdfs-6440-trunk-v5.patch, hdfs-6440-trunk-v6.patch, hdfs-6440-trunk-v7.patch, 
> hdfs-6440-trunk-v8.patch, hdfs-multiple-snn-trunk-v0.patch, 
> Multiple-Standby-NameNodes_V1.pdf
> Most of the work is already done to support more than 2 NameNodes (one 
> active, one standby). This would be the last bit to support running multiple 
> _standby_ NameNodes; one of the standbys should be available for fail-over.
> Mostly, this is a matter of updating how we parse configurations, some 
> complexity around managing the checkpointing, and updating a whole lot of 
> tests.

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