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https://issues.apache.org/jira/browse/HDFS-6469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120753#comment-14120753
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Todd Lipcon commented on HDFS-6469:
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bq. Total of 12 nodes, but with only one being actively used by clients.
That's not the recommended setup. Most of our customers collocate JNs, NNs, and
even ZK -- so on five nodes you'd typically have:
1) NN + JN + ZK
2) SB NN + JN + ZK
3) RM + JN + ZK
4) SB RM + JN + ZK
5 ZK + JN
So, I'm not sure that argument holds much water.
> Coordinated replication of the namespace using ConsensusNode
> ------------------------------------------------------------
>
> Key: HDFS-6469
> URL: https://issues.apache.org/jira/browse/HDFS-6469
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Attachments: CNodeDesign.pdf
>
>
> This is a proposal to introduce ConsensusNode - an evolution of the NameNode,
> which enables replication of the namespace on multiple nodes of an HDFS
> cluster by means of a Coordination Engine.
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