AnandSinha opened a new issue #4824: Regex patten based topic consumers prevent topic deletion URL: https://github.com/apache/pulsar/issues/4824 **Describe the bug** I am using Java client libraries. I created a consumer using `topicsPattern` for a regex pattern. As new topics matching the pattern get created, the consumer starts consuming from it. This is expected. However, I delete a topic that the consumer is consuming (even with an -f option); the topic does not get deleted (looks like it gets re-created). This is NOT EXPECTED, and is a DEFECT. **To Reproduce** Steps to reproduce the behavior: 1. Create a consumer using `topicsPattern` for a regex pattern say `persistent://public/default/test.*` 2. Create producers to start sending messages to topics test01, test02, test03 etc. 3. Once the consumer consumes the messages, stop producing to these topics 4. Execute `./pulsar-admin topics list public/default` and verify that these topics do exist. 5. Execute `./pulsar-admin topics delete -f persistent://public/default/test02` to delete the topic. 6. No errors are shown. 7. However, execute `./pulsar-admin topics list public/default` again and notice that test02 continues to exist. **Expected behavior** The system should allow deletion of topics even if regex pattern-based consumers have been attached to a topic. **Screenshots** NA **Desktop (please complete the following information):** - Java **Additional context** This problem gains importance as we want some listeners to ALL topics matching a certain pattern. And we have strong business reasons for the topics to be ephemeral in nature (create on demand, and delete when the work for that named topic is over)
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