[KAFKA-420] maintain HW correctly with only 1 replica in ISR

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.0
• Fix Version/s: 0.8.0
• Component/s: core
• Labels: bugs
• Assignee: Jun Rao
• Reporter: Jun Rao
• Created: 26/Jul/12 17:12
• Updated: 25/Aug/12 00:47
• Resolved: 25/Aug/12 00:47

Description

Currently, the HW maintenance logic is only triggered when handling fetch requests from the follower. As a result, if the ISR has only 1 replica, the HW won't be incremented since there is no request from the follower to trigger the maintenance logic.