thinker0 commented on PR #3818:
URL: https://github.com/apache/incubator-heron/pull/3818#issuecomment-1097464255

   This is the first time I've seen this error.
   
   ```
   [2022-04-13 10:38:18 +0900] [INFO]: State watch triggered for 
topologies.
   [2022-04-13 10:38:18 +0900] [INFO]: Adding children watch for path: 
/heron/topologies
   [2022-04-13 10:38:18 +0900] [INFO]: State watch triggered for 
topologies.
   INFO:     Application startup complete.
   [2022-04-13 10:38:18 +0900] [INFO]: Application startup 
complete.
   INFO:     Uvicorn running on http://0.0.0.0:31762 (Press CTRL+C to quit)
   [2022-04-13 10:38:18 +0900] [INFO]: Uvicorn running on 
http://0.0.0.0:31762 (Press CTRL+C to quit)
   ERROR:    Exception in ASGI application
   Traceback (most recent call last):
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/protocols/http/httptools_impl.py",
 line 390, in run_asgi
       result = await app(self.scope, self.receive, self.send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/middleware/proxy_headers.py",
 line 45, in __call__
       return await self.app(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/c0d3074d049fa733501c957df29d174fae232e84/fastapi-0.75.0-py3-none-any.whl/fastapi/applications.py",
 line 261, in __call__
       await super().__call__(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/applications.py",
 line 112, in __call__
       await self.middleware_stack(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 181, in __call__
       raise exc
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 159, in __call__
       await self.app(scope, receive, _send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/base.py",
 line 64, in __call__
       await response(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 244, in __call__
       await wrap(partial(self.listen_for_disconnect, receive))
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/a300cd1c27cc66d08e6736c76f7ae04743dcf9a8/anyio-3.5.0-py3-none-any.whl/anyio/_backends/_asyncio.py",
 line 574, in __aexit__
       raise exceptions[0]
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 240, in wrap
       await func()
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 234, in stream_response
       await send({"type": "http.response.body", "body": b"", "more_body": 
False})
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 156, in _send
       await send(message)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/protocols/http/httptools_impl.py",
 line 520, in send
       self.transport.write(body)
     File "uvloop/handles/stream.pyx", line 673, in uvloop.loop.UVStream.write
     File "uvloop/handles/handle.pyx", line 159, in 
uvloop.loop.UVHandle._ensure_alive
   RuntimeError: unable to perform operation on <TCPTransport closed=True 
reading=False 0x31ef7e0>; the handler is closed
   [2022-04-13 10:39:10 +0900] [ERROR]: Exception in ASGI application
   Traceback (most recent call last):
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/protocols/http/httptools_impl.py",
 line 390, in run_asgi
       result = await app(self.scope, self.receive, self.send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/middleware/proxy_headers.py",
 line 45, in __call__
       return await self.app(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/c0d3074d049fa733501c957df29d174fae232e84/fastapi-0.75.0-py3-none-any.whl/fastapi/applications.py",
 line 261, in __call__
       await super().__call__(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/applications.py",
 line 112, in __call__
       await self.middleware_stack(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 181, in __call__
       raise exc
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 159, in __call__
       await self.app(scope, receive, _send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/base.py",
 line 64, in __call__
       await response(scope, receive, send)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 244, in __call__
       await wrap(partial(self.listen_for_disconnect, receive))
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/a300cd1c27cc66d08e6736c76f7ae04743dcf9a8/anyio-3.5.0-py3-none-any.whl/anyio/_backends/_asyncio.py",
 line 574, in __aexit__
       raise exceptions[0]
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 240, in wrap
       await func()
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/responses.py",
 line 234, in stream_response
       await send({"type": "http.response.body", "body": b"", "more_body": 
False})
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/fc57f7e0aa93ba0fd0bd0a64dbaa11019af27aeb/starlette-0.17.1-py3-none-any.whl/starlette/middleware/errors.py",
 line 156, in _send
       await send(message)
     File 
"/var/lib/mesos/slaves/8955ddfd-4cab-4906-8664-97900802f975-S1028/frameworks/c663397e-a472-43bd-92dd-d97027fcf6ce-0000/executors/thermos-www-prod-heron-tracker-0-aedf8bc1-250d-4c8f-8a90-5c758a392980/runs/0564bcd9-eb4c-4362-82a4-98d4d1900aaf/sandbox/.pex/installed_wheels/2148a0851af15427075470f2dbc45ea582a6a5b0/uvicorn-0.11.7-py3-none-any.whl/uvicorn/protocols/http/httptools_impl.py",
 line 520, in send
       self.transport.write(body)
     File "uvloop/handles/stream.pyx", line 673, in uvloop.loop.UVStream.write
     File "uvloop/handles/handle.pyx", line 159, in 
uvloop.loop.UVHandle._ensure_alive
   RuntimeError: unable to perform operation on <TCPTransport closed=True 
reading=False 0x31ef7e0>; the handler is closed
   ERROR:    Exception in ASGI application
   ```


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