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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16830536#comment-16830536
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Íñigo Goiri commented on HDFS-13522:
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Thank you [~surendrasingh], I think the idea in [^HDFS-13522.001.patch] looks
good.
I think the counting of the RPC queries is a little out of place.
The metrics already track this kind of things (e.g., calls to the State Store
or calls to Standby NNs).
We should try to leverage the same.
For checking if it is a READ operation we also track that in OpCategory in
RouterRpcServer.
Not sure if we should leverage that or rely on the observer infra.
We should change the UI a little too to show the observer NN.
> 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
> Assignee: Chao Sun
> Priority: Major
> Attachments: HDFS-13522.001.patch
>
>
> 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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