BUG Service Unresponsive with High Request Volume for Unavailable Models

[gahoo]

Describe the bug

A large number request of model that not in the model list will cause the service not responsive.

To Reproduce

When the model set in immersivetranslate is not running. Then translate a page with a lot of content.

• xinference docker version: 0.12.2
• errors:

2024-06-28 10:34:06,169 xinference.api.restful_api 1 ERROR    [address=0.0.0.0:59492, pid=95] Model not found in the model list, uid: qwen2-instruct
Traceback (most recent call last):
  File "/opt/conda/lib/python3.10/site-packages/xinference/api/restful_api.py", line 1400, in create_chat_completion
    model = await (await self._get_supervisor_ref()).get_model(model_uid)
  File "/opt/conda/lib/python3.10/site-packages/xoscar/backends/context.py", line 227, in send
    return self._process_result_message(result)
  File "/opt/conda/lib/python3.10/site-packages/xoscar/backends/context.py", line 102, in _process_result_message
    raise message.as_instanceof_cause()
  File "/opt/conda/lib/python3.10/site-packages/xoscar/backends/pool.py", line 659, in send
    result = await self._run_coro(message.message_id, coro)
  File "/opt/conda/lib/python3.10/site-packages/xoscar/backends/pool.py", line 370, in _run_coro
    return await coro
  File "/opt/conda/lib/python3.10/site-packages/xoscar/api.py", line 384, in __on_receive__
    return await super().__on_receive__(message)  # type: ignore
  File "xoscar/core.pyx", line 558, in __on_receive__
    raise ex
  File "xoscar/core.pyx", line 520, in xoscar.core._BaseActor.__on_receive__
    async with self._lock:
  File "xoscar/core.pyx", line 521, in xoscar.core._BaseActor.__on_receive__
    with debug_async_timeout('actor_lock_timeout',
  File "xoscar/core.pyx", line 526, in xoscar.core._BaseActor.__on_receive__
    result = await result
  File "/opt/conda/lib/python3.10/site-packages/xinference/core/utils.py", line 45, in wrapped
    ret = await func(*args, **kwargs)
  File "/opt/conda/lib/python3.10/site-packages/xinference/core/supervisor.py", line 934, in get_model
    raise ValueError(f"Model not found in the model list, uid: {model_uid}")
ValueError: [address=0.0.0.0:59492, pid=95] Model not found in the model list, uid: qwen2-instruct

Expected behavior

Throw errors and not freeze.

Additional context

Add any other context about the problem here.