[KAFKA-1676] Ability to cancel replica reassignment in progress

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.8.1.1
• Fix Version/s: 2.5.0
• Component/s: controller
• Labels: newbie
• Assignee: Colin McCabe
• Reporter: Ryan Berdeen
• Created: 06/Oct/14 17:29
• Updated: 14/May/21 02:30
• Resolved: 14/May/21 02:30

Description

I've had several situations where I have started a replica reassignment that I've needed to cancel before it completed.

This has happened

• when moving to a new broker that turns out to be running on an impaired server
• if the extra replication hurts cluster performance
• dealing with replication bugs in kafka, like KAFKA-1670
• when a single replica reassignment is taking a long time, and I want to start more replica assignments without waiting for the current one to finish.

For the first three cases, as a last resort I have deleted the /admin/reassign_partitions key from ZooKeeper and restarted the controller. I would like to be able to do this by signaling the controller to stop, and to leave the list of assignments as they exist at that moment.