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https://issues.apache.org/jira/browse/HDFS-16669?focusedWorklogId=792250&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-792250
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ASF GitHub Bot logged work on HDFS-16669:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 18/Jul/22 17:00
Start Date: 18/Jul/22 17:00
Worklog Time Spent: 10m
Work Description: simbadzina opened a new pull request, #4584:
URL: https://github.com/apache/hadoop/pull/4584
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### Description of PR
Enhance client protocol to propagate last seen state IDs for multiple
nameservices.
### How was this patch tested?
This is a prerequisite for HDFS-13522. There are tests in the that JIRA.
### For code changes:
- [ X] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
Issue Time Tracking
-------------------
Worklog Id: (was: 792250)
Remaining Estimate: 0h
Time Spent: 10m
> Enhance client protocol to propagate last seen state IDs for multiple
> nameservices.
> -----------------------------------------------------------------------------------
>
> Key: HDFS-16669
> URL: https://issues.apache.org/jira/browse/HDFS-16669
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Simbarashe Dzinamarira
> Assignee: Simbarashe Dzinamarira
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The RPCHeader in the client protocol currently contains a single value to
> indicate the last seen state ID for a namenode.
> {noformat}
> optional int64 stateId = 8; // The last seen Global State ID
> {noformat}
> When there are multiple namenodes, such as in router based federation, the
> headers need to carry the state IDs for each of these nameservices that are
> part of the federation.
> This change is a prerequisite for HDFS-15522: RBF: Support observer node from
> Router-Based Federation
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