liangyepianzhou opened a new pull request, #25726:
URL: https://github.com/apache/pulsar/pull/25726

   Related: [PIP-474 PR #25706 
discussion](https://github.com/apache/pulsar/pull/25706)
   # Motivation
   
   The community consensus reached during the PIP-474 discussion is that new 
dispatching strategies (such as Hot Key Overflow) should be developed and 
validated as **standalone Dispatcher implementations**, rather than being 
embedded into the core class as conditional branches. This requires addressing 
three prerequisites:
   
   1. **Method visibility**: Core methods are `private`, preventing subclass 
overrides
   2. **Instantiation entry point**: `PersistentSubscription` has hardcoded 
creation logic, making it impossible to load third-party implementations
   3. **Lifecycle awareness**: Custom Dispatchers may manage additional 
resources (e.g., auxiliary ManagedLedgers) that need cleanup upon subscription 
deletion or topic unloading


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