[
https://issues.apache.org/jira/browse/HDFS-13522?focusedWorklogId=751100&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-751100
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ASF GitHub Bot logged work on HDFS-13522:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 31/Mar/22 17:17
Start Date: 31/Mar/22 17:17
Worklog Time Spent: 10m
Work Description: simbadzina opened a new pull request #4127:
URL: https://github.com/apache/hadoop/pull/4127
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### Description of PR
Enables routers to direct read calls to observer namenodes.
This is a refresh of a patch by Zhuobin Zhang to make it apply on current
trunk.
https://issues.apache.org/jira/secure/attachment/13027012/HDFS-13522.002.patch
### How was this patch tested?
Unit tests
### For code changes:
- [ x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
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Issue Time Tracking
-------------------
Worklog Id: (was: 751100)
Time Spent: 3h 50m (was: 3h 40m)
> 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: 3h 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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