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https://issues.apache.org/jira/browse/HDFS-13522?focusedWorklogId=792417&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-792417
 ]

ASF GitHub Bot logged work on HDFS-13522:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 19/Jul/22 02:35
            Start Date: 19/Jul/22 02:35
    Worklog Time Spent: 10m 
      Work Description: zhengchenyu commented on code in PR #4311:
URL: https://github.com/apache/hadoop/pull/4311#discussion_r924006263


##########
hadoop-common-project/hadoop-common/src/main/proto/RpcHeader.proto:
##########
@@ -91,6 +91,7 @@ message RpcRequestHeaderProto { // the header for the 
RpcRequest
   optional RPCTraceInfoProto traceInfo = 6; // tracing info
   optional RPCCallerContextProto callerContext = 7; // call context
   optional int64 stateId = 8; // The last seen Global State ID
+  map<string, int64> nameserviceStateIds = 9; // Last seen state IDs for 
multiple nameservices.

Review Comment:
    But it is not supported in my Mac. My proto compiler version as below:
   ```
    % protoc --version
   libprotoc 2.5.0
   ```
   In github release,I found it is supported after v3.0.0-alpha-2. See link: 
https://github.com/protocolbuffers/protobuf/releases?page=10





Issue Time Tracking
-------------------

    Worklog Id:     (was: 792417)
    Time Spent: 19.5h  (was: 19h 20m)

> 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, 
> observer_reads_in_rbf_proposal_simbadzina_v1.pdf
>
>          Time Spent: 19.5h
>  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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