315157973 opened a new issue #7730:
URL: https://github.com/apache/pulsar/issues/7730
**Is your feature request related to a problem? Please describe.**
The existing settings is not fine-grained enough, and many settings can only
be set at the namespace level.
The following settings are hoped to support Topic level：
- [ ] topicDispatchRate
- [ ] subscriptionDispatchRate
- [ ] message_ttl_in_seconds
- [ ] subscription_expiration_time_minutes
- [ ] retention_policies
- [ ] DelayedDeliveryPolicies
- [ ] SubscriptionAuthMode
- [ ] max_producers_per_topic
- [ ] max_consumers_per_topic
- [ ] max_consumers_per_subscription
- [ ] max_unacked_messages_per_consumer
- [ ] max_unacked_messages_per_subscription
- [ ] compaction_threshold
- [ ] is_allow_auto_update_schema
- [ ] schema_validation_enforced
...
**Describe the solution you'd like**
Use SystemTopic to save and update these Topic level settings
**Describe alternatives you've considered**
We have considered using zk, but the amount of configuration will be
relatively large, not suitable for using zk
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