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https://issues.apache.org/jira/browse/KAFKA-18938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17933233#comment-17933233
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PoAn Yang commented on KAFKA-18938:
-----------------------------------
[~rameshkanna], could you try latest 3.9 branch?
1. Modify following fields in `config/kraft/controller.properties`.
{noformat}
node.id=2
listeners=CONTROLLER://:9094
advertised.listeners=CONTROLLER://localhost:9094
{noformat}
2. Format first node with `config/kraft/server.properties` and start it.
{noformat}
> ./bin/kafka-storage.sh format -t "zuV6tFqAQhSGfFe97O-9cw" --config
> ./config/kraft/server.properties --standalone
Formatting dynamic metadata voter directory /tmp/kraft-combined-logs with
metadata.version 3.9-IV0.
> ./bin/kafka-server-start.sh ./config/kraft/server.properties
{noformat}
3. Format second node with `config/kraft/controller.properties` and start it.
{noformat}
> ./bin/kafka-storage.sh format -t "zuV6tFqAQhSGfFe97O-9cw" --config
> ./config/kraft/controller.properties --no-initial-controllers
Formatting metadata directory /tmp/kraft-controller-logs with metadata.version
3.9-IV0.
> ./bin/kafka-server-start.sh ./config/kraft/controller.properties
{noformat}
4. Describe cluster status. There is one voter and one observer.
{noformat}
> ./bin/kafka-metadata-quorum.sh --bootstrap-controller localhost:9093 describe
> --status
ClusterId: zuV6tFqAQhSGfFe97O-9cw
LeaderId: 1
LeaderEpoch: 1
HighWatermark: 959
MaxFollowerLag: 0
MaxFollowerLagTimeMs: 0
CurrentVoters: [{"id": 1, "directoryId": "eDoUCgrMQ8CdTH4UUBkBOw",
"endpoints": ["CONTROLLER://localhost:9093"]}]
CurrentObservers: [{"id": 2, "directoryId": "93g3C9kCS3qDz75w8NH8UQ"}]
{noformat}
5. Add second node as controller.
{noformat}
> ./bin/kafka-metadata-quorum.sh --bootstrap-controller localhost:9093
> --command-config ./config/kraft/controller.properties add-controller
Added controller 2 with directory id 93g3C9kCS3qDz75w8NH8UQ and endpoints:
CONTROLLER://localhost:9094
{noformat}
6. Describe cluster status again and there are two voters.
{noformat}
> ./bin/kafka-metadata-quorum.sh --bootstrap-controller localhost:9093 describe
> --status
ClusterId: zuV6tFqAQhSGfFe97O-9cw
LeaderId: 1
LeaderEpoch: 1
HighWatermark: 1093
MaxFollowerLag: 0
MaxFollowerLagTimeMs: 0
CurrentVoters: [{"id": 1, "directoryId": "eDoUCgrMQ8CdTH4UUBkBOw",
"endpoints": ["CONTROLLER://localhost:9093"]}, {"id": 2, "directoryId":
"93g3C9kCS3qDz75w8NH8UQ", "endpoints": ["CONTROLLER://localhost:9094"]}]
CurrentObservers: []
{noformat}
> Kraft version and metadata version wrongly showing
> --------------------------------------------------
>
> Key: KAFKA-18938
> URL: https://issues.apache.org/jira/browse/KAFKA-18938
> Project: Kafka
> Issue Type: Bug
> Components: controller, kraft
> Affects Versions: 3.9.0
> Reporter: Rameshkanna N
> Priority: Major
>
> I am using Kafka {*}3.9.0{*}. When starting a {*}KRaft controller{*}, it
> shows {*}metadata version 3.0-IV1{*}, but when formatting storage, it shows
> {*}version 3.9-IV0{*}. When I try to confirm the version using:
> {{sh kafka-features.sh --bootstrap-controller localhost:9091 describe}}
> it shows {*}finalized KRaft version 0{*}.
> Can anyone help me resolve this issue?
> Logs:
> sh kafka-features.sh --bootstrap-controller localhost:9091 describe
> Feature: kraft.version SupportedMinVersion: 0 SupportedMaxVersion: 1
> FinalizedVersionLevel: 0 Epoch: 6
> Feature: metadata.version SupportedMinVersion: 3.0-IV1
> SupportedMaxVersion: 3.9-IV0
> FinalizedVersionLevel: 3.9-IV0 Epoch: 6
> Server.log:
> [2025-03-06 13:40:40,569] INFO [ControllerServer id=102] Waiting for all of
> the SocketServer Acceptors to be started (kafka.server.ControllerServer)
> [2025-03-06 13:40:40,569] INFO [ControllerServer id=102] Finished waiting for
> all of the SocketServer Acceptors to be started
> (kafka.server.ControllerServer)
> [2025-03-06 13:40:40,569] INFO [ControllerRegistrationManager id=102
> incarnation=h-3EozNTQZGbhcsV_119Fg] initialized channel manager.
> (kafka.server.ControllerRegistrationManager)
> [2025-03-06 13:40:40,569] INFO [ControllerRegistrationManager id=102
> incarnation=h-3EozNTQZGbhcsV_119Fg] maybeSendControllerRegistration: cannot
> register yet because the metadata.version is still 3.0-IV1, which does not
> support KIP-919 controller registration.
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