[KAFKA-13783] Remove reason prefixing in JoinGroupRequest and LeaveGroupRequest

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 3.2.0
• Assignee: David Jacot
• Reporter: David Jacot
• Created: 30/Mar/22 08:11
• Updated: 07/Apr/22 08:47
• Resolved: 31/Mar/22 12:34

Description

KIP-800 introduced a mechanism to pass a reason in the join group request and in the leaver group request. A default reason is used unless one is provided by the user. In this case, the custom reason is prefixed by the default one.

When we tried to used this in Kafka Streams, we noted a significant degradation of the performances, see https://github.com/apache/kafka/pull/11873. It is not clear wether the prefixing is the root cause of the issue or not. To be on the safe side, I think that we should remove the prefixing. It does not bring much anyway as we are still able to distinguish a custom reason from the default one on the broker side.

Issue Links

• links to: GitHub Pull Request #11971