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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17541887#comment-17541887
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zhengchenyu commented on HDFS-13522:
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Thanks for this good patch!
But I have a question. In this patch, router hide the client's state id. I
think it means we can not enable or disable this feature, and can not configure.
As I know, Observer NameNode can't keep absolute consistency. So user may need
to configure auto-mysnc-period and some other parameter so that meet different
user's demand.
I think it had better to use client's state id in client rpc call level. (Note:
of course, we need more change, especially mount multi nameservice. )
> 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, RBF_ Observer support.pdf, Router+Observer RPC
> clogging.png, ShortTerm-Routers+Observer.png
>
> Time Spent: 8h 10m
> 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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