This might not be the place to discuss this but I ll share i Prefect Community #ask-community

This might not be the place to discuss this, but I...

orangekame3

05/28/2024, 2:30 AM

This might not be the place to discuss this, but I'll share it anyway. It seems that the latest versions of

prefect="^2.19.2"

and

uvloop="^0.19.0"

are not compatible. I'm using

fastapi

in conjunction with

prefect

, and the issue is that

fastapi="^0.111.0"

has a dependency on

uvloop="^0.19.0"

by default. Since

fastapi

is a widely used package, I thought it would be worth sharing this information here. I managed to circumvent this issue by downgrading

fastapi

to version

0.110.3

orangekame3

05/28/2024, 2:33 AM

For more detailed information, I conducted my investigation using the following

pyproject.toml

. The application works fine without

uvloop

, but when

uvloop

is installed, the error mentioned earlier occurs.

Copy code

[tool.poetry]
name = "backend"
version = "0.1.0"
description = ""
authors = ["orangekame3"]
readme = "README.md"

[tool.poetry.dependencies]
python = "^3.10.13"
prefect = "^2.19.2"
httpx = "^0.27.0"
uvloop = "^0.19.0"


[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

orangekame3

05/28/2024, 2:34 AM

Copy code

11:18:56.144 | ERROR   | prefect.flow_runs.runner - Failed to start process for flow run 'ee1bb4f1-9b6c-4127-8e53-229ea4b8129c'.
Traceback (most recent call last):
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/prefect/runner/runner.py", line 970, in _submit_run_and_capture_errors
    status_code = await self._run_process(
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/prefect/runner/runner.py", line 584, in _run_process
    process = await run_process(
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/prefect/utilities/processutils.py", line 258, in run_process
    async with open_process(
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/contextlib.py", line 199, in __aenter__
    return await anext(self.gen)
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/prefect/utilities/processutils.py", line 202, in open_process
    process = await anyio.open_process(command, **kwargs)
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/anyio/_core/_subprocesses.py", line 126, in open_process
    return await get_asynclib().open_process(
  File "/Users/orangekame3/src/github.com/orangekame3/qdash/.venv/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 1041, in open_process
    process = await asyncio.create_subprocess_exec(
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/asyncio/subprocess.py", line 218, in create_subprocess_exec
    transport, protocol = await loop.subprocess_exec(
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/asyncio/base_events.py", line 1681, in subprocess_exec
    transport = await self._make_subprocess_transport(
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/asyncio/unix_events.py", line 198, in _make_subprocess_transport
    with events.get_child_watcher() as watcher:
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/asyncio/events.py", line 788, in get_child_watcher
    return get_event_loop_policy().get_child_watcher()
  File "/Users/orangekame3/.pyenv/versions/3.10.13/lib/python3.10/asyncio/events.py", line 616, in get_child_watcher
    raise NotImplementedError
NotImplementedError
```

orangekame3

05/28/2024, 7:18 AM

issue about this https://github.com/PrefectHQ/prefect/issues/13588

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