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https://issues.apache.org/jira/browse/HDFS-13098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16352096#comment-16352096
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Yiqun Lin commented on HDFS-13098:
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Hi, [~elgoiri], comments make sense to me.
{quote}In any case, the first version could prevent moving DNs out of the
current subcluster.
{quote}
I also agree with this.
>From previous comments, the DataNodes will firstly register in the Router,
>then talk to NNs afterwards. I think here the Router will maintain the
><DataNode, NameNode(SubCluster)> mapping, which will be used in DN's
>restarting. Do we plan to persist this mapping info in the State Store?
> RBF: Datanodes interacting with Routers
> ---------------------------------------
>
> Key: HDFS-13098
> URL: https://issues.apache.org/jira/browse/HDFS-13098
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Íñigo Goiri
> Priority: Major
>
> Datanodes talk to particular Namenodes. We could use the Router
> infrastructure for the Datanodes to register/heartbeating into them and the
> Routers would forward this to particular Namenodes. This would make the
> assignment of Datanodes to subclusters potentially more dynamic.
> The implementation would potentially include:
> * Router to implement part of DatanodeProtocol
> * Forwarding DN messages into Routers
> * Policies to assign datanodes to subclusters
> * Datanodes to make blockpool configuration dynamic
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