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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17571722#comment-17571722
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ZanderXu commented on HDFS-13522:
---------------------------------

[~simbadzina][~zhengchenyu] 

bq. We can do a combination of both Design A and B.

How about we focus on B first, and A as a bonus item?  Because most people will 
use B, very few people will use A. 

I strongly recommend splitting this issue with multiple tasks in fine-grained 
modules to accomplish this large feature. It will be helpful for reviewer to 
review and merge.

> RBF: 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: Simbarashe Dzinamarira
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HDFS-13522.001.patch, HDFS-13522.002.patch, 
> HDFS-13522_WIP.patch, HDFS-13522_proposal_zhengchenyu_v1.pdf, RBF_ Observer 
> support.pdf, Router+Observer RPC clogging.png, 
> ShortTerm-Routers+Observer.png, 
> observer_reads_in_rbf_proposal_simbadzina_v1.pdf, 
> observer_reads_in_rbf_proposal_simbadzina_v2.pdf
>
>          Time Spent: 20h
>  Remaining Estimate: 0h
>
> 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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