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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573704#comment-17573704
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zhengchenyu commented on HDFS-13522:
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[~xuzq_zander]
Hi, the use case about design A is very rare indeed. But Design A also have
advantage.
(1) More flexible
Client could set their msync period time by itself.
Example: In our cluster, one name service, some special user detect hdfs file
is created periodically, may need high time precision, means more frequent
msync.(Though I am oppose to this way).
(2) Save msync
I think there is no need to call msync periodically for most HIVE, MR
application. Design A will save more msync than Design B。
I agree your suggestion that focus on Design B first, add Design A as a bonus
item. It is no easy to review both Design A and Design B.
> 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 50m
> 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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