[KAFKA-13424] Redundant cleanup operations in TopicChangeHandler or TopicDeletionManager

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.8.0
• Component/s: controller
• Assignee: Unassigned
• Reporter: Xiaobing Fang
• Created: 31/Oct/21 07:15
• Updated: 31/Oct/21 07:18

Description

In `TopicDeletionManager.completeDeleteTopic()`, `controllerContext.removeTopic(topic)` will be done after deleting topic znode in `client.deleteTopic(topic, controllerContext.epochZkVersion)`. This will trigger `TopicChangeHandler`, and process `controllerContext.removeTopic` again in `processTopicChange`. 

It is equivalent to deleting Topic once and executing `controllerContext.removeTopic` twice. Is this the expected situation？