THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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In this approach, we would maintain the current delete logic. The controller will send a StopReplicaRequest to all replicas for a topic, and will keep retrying this request until all replicas respond successfully. In this implementation, the deletion logic will not be simplified.
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Option 1: best effort strategy
Make a best effort attempt to send a StopReplicaRequest to all replicas. The controller will give up after a certain number of retries and will complete the delete. This will not simplify the topic deletion code, however it will prevent delete topic requests from being blocked if one of the replicas is down. This will now be relatively safe, as stale topics will be deleted when a broker receives an initial LeaderAndIsrRequest, however it could prevent space from being reclaimed from a broker that does not respond to a StopReplicaRequest(s) before it is timed out, but is otherwise alive.
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Option 2: send StopReplicaRequest(s) to online brokers only
In this approach, the controller will send StopReplicaRequests to only the brokers that are online, and will wait for a response from these brokers before marking the delete as successful. This will allow a topic delete to take place while some replicas are offline. If any replicas return to being online, they will receive an initial LeaderAndIsrRequest that will allow them to clear up any stale state. This is similar to the "best effort strategy above".
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Option 3: immediate effective delete, staged cleanup strategy
This strategy would allow brokers to effectively delete topics immediately, ensuring deletions do not block creation and use of a new topic with the same name. This is the proposed option to clean up the deletion logic and would not block topic recreation.
Upon receiving a DeleteTopicsRequest, if the IBP is >= MIN_TOPIC_ID_VERSION move the /brokers/topics/[topic] znode payload to /admin/delete_topics_by_id/[topicId], and immediately reply with a successful response. At this point, the topic is considered deleted, and a topic with the same name can be created.
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