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https://issues.apache.org/jira/browse/HDFS-6469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069597#comment-14069597
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Konstantin Shvachko commented on HDFS-6469:
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??A customer can use just QJM (which gives at least 3 replicas) and can
optionally have a local parallel editlog if they want additional redundancy.??
Sanjay, it looks to me the same as in CNode case. As I said in my [earlier
comment
here:|https://issues.apache.org/jira/browse/HDFS-6469?focusedCommentId=14021017&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14021017]
"edits are optional for CNodes and can be completely eliminated for performance
reasons. Recent transactions are anyways stored in CE."
> 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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