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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17190767#comment-17190767
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CR Hota commented on HDFS-13522:
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[~elgoiri] Thanks for following-up.
[~hemanthboyina] Thanks for uploading the patch and feel free to take this
jira. I can also help with the code review. Meanwhile can you help me
understand if the consistency guarantees are same with and without router or
router relaxes the consistency guarantees ? This was a discussion point when we
were last working on this. Please refer to the notes in the thread. The last
design doc which was uploaded was intended to allow routers in the middle to
still honor the same consistency guarantees that client to
Nameode/ObserverNamenode honor without routers.
> 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, HDFS-13522_WIP.patch, RBF_
> Observer support.pdf, Router+Observer RPC clogging.png,
> ShortTerm-Routers+Observer.png
>
>
> 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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