OSError: [Errno 24] Too many open files

[caumons]

After upgrading channels_redis from version 2.2.1 to 2.3 I'm periodically getting the following exception. I've had to downgrade to version 2.2.1 again to fix it.

Traceback (most recent call last):
  File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/django/core/management/base.py", line 316, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/django/core/management/base.py", line 353, in execute
    output = self.handle(*args, **options)
  File "/home/dev/myproj/myfile.py", line 62, in handle
    self.send_to_ws('update_multiplier', multiplier)
  File "/home/dev/myproj/myfile.py", line 24, in send_to_ws
    'data': data,
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/asgiref/sync.py", line 64, in __call__
    return call_result.result()
  File "/usr/lib/python3.5/concurrent/futures/_base.py", line 398, in result
    return self.__get_result()
  File "/usr/lib/python3.5/concurrent/futures/_base.py", line 357, in __get_result
    raise self._exception
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/asgiref/sync.py", line 78, in main_wrap
    result = await self.awaitable(*args, **kwargs)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/channels_redis/core.py", line 559, in group_send
    async with self.connection(self.consistent_hash(group)) as connection:
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/channels_redis/core.py", line 742, in __aenter__
    self.conn = await self.pool.pop()
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/channels_redis/core.py", line 49, in pop
    conns.append(await aioredis.create_redis(**self.host, loop=loop))
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/aioredis/commands/__init__.py", line 177, in create_redis
    loop=loop)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/aioredis/connection.py", line 107, in create_connection
    timeout, loop=loop)
  File "/usr/lib/python3.5/asyncio/tasks.py", line 387, in wait_for
    return (yield from fut)
  File "/home/dev/virtualenvs/myproj/lib/python3.5/site-packages/aioredis/stream.py", line 19, in open_connection
    lambda: protocol, host, port, **kwds)
  File "/usr/lib/python3.5/asyncio/base_events.py", line 776, in create_connection
    raise exceptions[0]
  File "/usr/lib/python3.5/asyncio/base_events.py", line 743, in create_connection
    sock = socket.socket(family=family, type=type, proto=proto)
  File "/usr/lib/python3.5/socket.py", line 134, in __init__
    _socket.socket.__init__(self, family, type, proto, fileno)
OSError: [Errno 24] Too many open files

I'm using python 3.5.6 and some of the libs are:

aioredis        1.1.0  
asgiref         2.3.2
channels        2.1.3  
django-redis    4.9.0
redis           2.10.6

[andrewgodwin]

This is a system-level thing - you need to increase your ulimit for file handles (it's likely a small change in that patch version resulted in more file handles). I can't give instructions here for every OS, but if you search for ulimit file handles and your OS name you should find instructions on how to raise it.