[KAFKA-15345] KRaft leader should notify the listener only when it has read up to the leader's epoch

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.6.0
• Assignee: José Armando García Sancio
• Reporter: José Armando García Sancio
• Created: 15/Aug/23 14:38
• Updated: 18/Aug/23 01:48
• Resolved: 18/Aug/23 01:48

Description

In a non-empty log the KRaft leader only notifies the listener of leadership when it has read to the leader's epoch start offset. This guarantees that the leader epoch has been committed and that the listener has read all committed offset/records.

Unfortunately, the KRaft leader doesn't do this when the log is empty. When the log is empty the listener is notified immediately when it has become leader. This makes the API inconsistent and harder to program against.

Issue Links

• links to: GitHub Pull Request #14213