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https://issues.apache.org/jira/browse/HDFS-13522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17655115#comment-17655115
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Simbarashe Dzinamarira commented on HDFS-13522:
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Thanks [~tasanuma] for adjusting the fix versions. Yeah, it would be get this
feature in branch-3.3. Below is the sequence of other patches that need to be
done for this features patch to apply cleanly. Following this sequence worked
for me on a fork of branch-3.3.
# HDFS-14090
# HDFS-15417
# HDFS-16296
# HDFS-16302
# HDFS-15757
# HDFS-13274
# *Then HDFS-13522*
# HDFS-16065
# HDFS-16313
# HDFS-16273
# *Then HDFS-16767*
I'd recommend creating a Jira that has these backports as sub-tasks.
> HDFS-13522: Add federated nameservices states to client protocol and
> propagate it between routers and clients.
> --------------------------------------------------------------------------------------------------------------
>
> 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
> Fix For: 3.4.0
>
> 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,
> 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{}}}.
> This patch captures the state of all namespaces in the routers and propagates
> it to clients. A follow up patch will change router behavior to direct
> requests to the observer.
>
>
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