[KAFKA-10521] Remove ZK watch for completing partition reassignment

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.7.0
• Component/s: controller
• Assignee: Jason Gustafson
• Reporter: David Arthur
• Created: 24/Sep/20 12:41
• Updated: 14/Oct/20 01:08
• Resolved: 14/Oct/20 01:08

Description

This is a follow-on from KAFKA-8836.

Currently we have a ZK watch on the partition "/state" znode which fires a handler in the controller to check if a reassignment can be completed due to replicas catching up with the leader. This is located in KafkaController#processPartitionReassignmentIsrChange

Following the change to updating ISR with the new AlterIsr RPC, we would like to remove this ZK watch and replace it with a direct call when writing out a new ISR in the controller.

Issue Links

• links to: GitHub Pull Request #9353