[KAFKA-6146] minimize the number of triggers enqueuing PreferredReplicaLeaderElection events

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 1.1.0
• Assignee: Onur Karaman
• Reporter: Jun Rao
• Created: 30/Oct/17 18:03
• Updated: 09/Nov/17 01:08
• Resolved: 09/Nov/17 01:08

Description

We currently enqueue a PreferredReplicaLeaderElection controller event in PreferredReplicaElectionHandler's handleCreation, handleDeletion, and handleDataChange. We can just enqueue the event upon znode creation and after preferred replica leader election completes. The processing of this latter enqueue will register the exist watch on PreferredReplicaElectionZNode and perform any pending preferred replica leader election that may have occurred between completion and registration.

Issue Links

• links to: GitHub Pull Request #4189