[KAFKA-10613] Broker should not set leader epoch if the list-offset request version < 4

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.0, 2.2.0, 2.3.0, 2.4.0, 2.5.0, 2.6.0
• Fix Version/s: 2.7.0
• Component/s: core
• Assignee: Guozhang Wang
• Reporter: Guozhang Wang
• Created: 14/Oct/20 21:41
• Updated: 15/Oct/20 17:07
• Resolved: 15/Oct/20 17:04

Description

The list-offset response added a new field in version 4:

        { "name": "LeaderEpoch", "type": "int32", "versions": "4+" }

And the compiled code would throw UnsupportedVersionException if that field is not default (-1) with version < 4. However, on the broker side we forget to add the logic to not setting this field based on the request version. This would cause old versioned clients' list-offset call to always get UnsupportedVersionException and an empty result would be returned.

Issue Links

• links to: GitHub Pull Request #9438