[jira] [Created] (RATIS-2629) Netty RPC server processes requests on the I/O event loop and lacks exception handling

["Abhishek Pal (Jira)" <ji...@apache.org>]

Abhishek Pal created RATIS-2629:
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             Summary:  Netty RPC server processes requests on the I/O event loop and lacks exception handling
                 Key: RATIS-2629
                 URL: https://issues.apache.org/jira/browse/RATIS-2629
             Project: Ratis
          Issue Type: Bug
            Reporter: Abhishek Pal
            Assignee: Abhishek Pal


NettyRpcService handles every inbound request synchronously on the Netty IO event-loop thread and its inbound handler does not override exceptionCaught.

This can cause:
- a slow or long-running request occupies the worker thread delaying all other requests on that event loop
-  only IOException is converted into an error reply. Any other Throwable escapes the handler with no exceptionCaught, Netty's default handling only logs it and never writes a reply, so the client blocks until its request timeout.

 The gRPC transport does not have this problem because it drives the asynchronous server APIs like appendEntriesAsync instead of blocking the transport thread.



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