update pool clear logic

Author: blink1073

pymongo/asynchronous/topology.py

@@ -887,9 +887,8 @@ async def _handle_error(self, address: _Address, err_ctx: _ErrorContext) -> None
                 # Unknown command error during the connection handshake.
                 if not self._settings.load_balanced:
                     await self._process_change(ServerDescription(address, error=error))
-                # Clear the pool if the backpressure label was not applied.
-                if not error.has_error_label("SystemOverloadedError"):
-                    await server.reset(service_id)
+                # Clear the pool.
+                await server.reset(service_id)
         elif isinstance(error, ConnectionFailure):
             if isinstance(error, WaitQueueTimeoutError) or (
                 error.has_error_label("SystemOverloadedError")

pymongo/synchronous/topology.py

@@ -885,9 +885,8 @@ def _handle_error(self, address: _Address, err_ctx: _ErrorContext) -> None:
                 # Unknown command error during the connection handshake.
                 if not self._settings.load_balanced:
                     self._process_change(ServerDescription(address, error=error))
-                # Clear the pool if the backpressure label was not applied.
-                if not error.has_error_label("SystemOverloadedError"):
-                    server.reset(service_id)
+                # Clear the pool.
+                server.reset(service_id)
         elif isinstance(error, ConnectionFailure):
             if isinstance(error, WaitQueueTimeoutError) or (
                 error.has_error_label("SystemOverloadedError")