[I] Offload NotifyLeaderAndIsr from RPC worker threads [fluss]

["zuston (via GitHub)" <gi...@apache.org>]

zuston opened a new issue, #3646:
URL: https://github.com/apache/fluss/issues/3646

   ### Search before asking
   
   - [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar.
   
   
   ### Motivation
   
   ### Background
   
   `NotifyLeaderAndIsr` is currently processed on the RPC worker thread. The underlying `becomeLeaderOrFollower` operation may perform relatively expensive replica state transitions, such as initializing local replicas and updating replica fetchers. A slow transition can therefore occupy an RPC worker thread and delay unrelated RPC requests.
   
   ### Solution
   
   Introduce a dedicated single-thread executor for `NotifyLeaderAndIsr` operations.
   The executor is created and managed by `TabletServer` , injected into `TabletService` , and gracefully shut down before replica-related resources are closed. `TabletService` parses the request on the RPC worker thread and submits the replica state transition to the dedicated executor.
   A single thread is sufficient because replica state changes are already serialized by the replica state change lock. It also preserves the execution order of `NotifyLeaderAndIsr` requests while preventing slow transitions from blocking other RPCs.
   The RPC semantics remain unchanged: the response future is completed only after `becomeLeaderOrFollower` finishes.
   
   ### Solution
   
   _No response_
   
   ### Anything else?
   
   _No response_
   
   ### Willingness to contribute
   
   - [x] I'm willing to submit a PR!


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Re: [I] Offload NotifyLeaderAndIsr from RPC worker threads [fluss]

["fresh-borzoni (via GitHub)" <gi...@apache.org>]

fresh-borzoni closed issue #3646: Offload NotifyLeaderAndIsr from RPC worker threads
URL: https://github.com/apache/fluss/issues/3646


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