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https://issues.apache.org/jira/browse/HDFS-13312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16621015#comment-16621015
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Íñigo Goiri commented on HDFS-13312:
------------------------------------

As I'm working on running Hadoop on VMs, I see more and more the need to have a 
framework to discover servers.
I played with DNS but this works for fixed setups but it's not very elastic 
(I'm limited to having always say 3 NNs).

I'll open a JIRA in commons to define the framework and use it as the branch 
for working on this.
As there are subparts in both HDFS and YARN this won't be a pure umbrella; I 
hope linking JIRAs and merging into the branch is fine.
Anyway, I'll link the JIRA once I open it here and we can start the discussion 
there.

> NameNode High Availability ZooKeeper based discovery rather than explicit 
> nn1,nn2 configs
> -----------------------------------------------------------------------------------------
>
>                 Key: HDFS-13312
>                 URL: https://issues.apache.org/jira/browse/HDFS-13312
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, hdfs, namenode, nn
>    Affects Versions: 2.9.1
>            Reporter: Hari Sekhon
>            Priority: Major
>         Attachments: HDFS-13312.000.patch, HDFS-13312.001.patch, 
> HDFS-13312.002.patch, HDFS-13312.003.patch
>
>
> Improvement Request for HDFS NameNode HA to use ZooKeeper based dynamic 
> discovery rather than explicitly setting the NameNode addresses via nn1,n2 in 
> the configs.
> One proprietary Hadoop vendor already uses ZK for Resource Manager HA 
> discovery - it makes sense that the open source core should do this for both 
> Yarn and HDFS.



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