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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16461763#comment-16461763
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Íñigo Goiri commented on HDFS-13522:
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There are two main changes to do:
* Collect the OBSERVER state in {{NamenodeHeartbeatService}} and store it in
the {{MembershipStore}} through the {{FederationNamenodeServiceState}}
* Allow the {{RouterRpcClient}} to pick OBSERVER NNs to perform the operations.
Both changes should be fairly easy to add.
It would be handy to have a setup of the MiniDFSCluster that sets OBSERVER NNs
automatically and having some predefined contract that makes sure that requests
are going to the OBSERVER. Is there something along those lines already
available in HDFS-12943?
> Support observer node from Router-Based Federation
> --------------------------------------------------
>
> Key: HDFS-13522
> URL: https://issues.apache.org/jira/browse/HDFS-13522
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: federation, namenode
> Reporter: Erik Krogen
> Priority: Major
>
> Changes will need to occur to the router to support the new observer node.
> One such change will be to make the router understand the observer state,
> e.g. {{FederationNamenodeServiceState}}.
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