Redis ERR unknown command 'BZPOPMIN'

Question

I installed Redis version 4.0.9 in a Ubuntu Linux Subsystem on Windows 10 by following these instructions (i.e. sudo apt-get install redis-server).

I am following this tutorial on Django channels, and I ran the following code:

>>> import channels.layers
>>> channel_layer = channels.layers.get_channel_layer()
>>> from asgiref.sync import async_to_sync
>>> async_to_sync(channel_layer.send)('test_channel', {'type': 'hello'})
>>> async_to_sync(channel_layer.receive)('test_channel')

When the last line above is executed, I get this error:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "C:\Users\xyz\Anaconda3\envs\django\lib\site-packages\asgiref\sync.py", line 120, in __call__
    return call_result.result()
  File "C:\Users\xyz\Anaconda3\envs\django\lib\concurrent\futures\_base.py", line 425, in result
    return self.__get_result()
  File "C:\Users\xyz\Anaconda3\envs\django\lib\concurrent\futures\_base.py", line 384, in __get_result
    raise self._exception
  File "C:\Users\xyz\Anaconda3\envs\django\lib\site-packages\asgiref\sync.py", line 180, in main_wrap
    result = await self.awaitable(*args, **kwargs)
  File "C:\Users\xyz\Anaconda3\envs\django\lib\site-packages\channels_redis\core.py", line 485, in receive
    return (await self.receive_single(channel))[1]
  File "C:\Users\xyz\Anaconda3\envs\django\lib\site-packages\channels_redis\core.py", line 508, in receive_single
    index, channel_key, timeout=self.brpop_timeout
  File "C:\Users\xyz\Anaconda3\envs\django\lib\site-packages\channels_redis\core.py", line 345, in _brpop_with_clean
    result = await connection.bzpopmin(channel, timeout=timeout)
aioredis.errors.ReplyError: ERR unknown command 'BZPOPMIN'

On this page, someone suggested using Redis version 5. How do I install Redis version 5 on Windows 10? Any other ideas on how to solve this issue?

Answer 1

I think the problem is in the compatibility with version of the channels-redis package! I had already tested channels some time ago and it worked beautifully with channels-redis version 2.4.2, recently they are in version 3.0.1 and this version doesn't work properly yet I don't know why.

Try install the version 2.4.2 with pip:

pip install channels-redis==2.4.2