robobario commented on PR #20340:
URL: https://github.com/apache/kafka/pull/20340#issuecomment-3177658871
For example, if I:
1. edit `server.properties` to
`share.coordinator.state.topic.replication.factor=3`
2. run up the broker as per the quickstart:
```
KAFKA_CLUSTER_ID="$(bin/kafka-storage.sh random-uuid)"
bin/kafka-storage.sh format --standalone -t $KAFKA_CLUSTER_ID -c
config/server.properties
bin/kafka-server-start.sh config/server.properties
```
3. `bin/kafka-features.sh --bootstrap-server localhost:9092 upgrade
--feature share.version=1`
4. `bin/kafka-topics.sh --create --topic my_topic --bootstrap-server
localhost:9092`
5. `bin/kafka-console-share-consumer.sh --bootstrap-server localhost:9092
--topic quickstart-events`
Now I will see logs in the server like:
```
[2025-08-12 16:28:56,007] INFO Sent auto-creation request for
Set(__share_group_state) to the active controller.
(kafka.server.DefaultAutoTopicCreationManager)
[2025-08-12 16:28:56,009] WARN Auto topic creation failed for
__share_group_state with error 'INVALID_REPLICATION_FACTOR': Unable to
replicate the partition 3 time(s): The target replication factor of 3 cannot be
reached because only 1 broker(s) are registered.
(kafka.server.DefaultAutoTopicCreationManager)
```
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