return self._avail_channels.pop()
IndexError: pop from empty list

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/redis/connection.py", line 699, in connect
    sock = self.retry.call_with_retry(
  File "/usr/local/lib/python3.10/site-packages/redis/retry.py", line 46, in call_with_retry
    return do()
  File "/usr/local/lib/python3.10/site-packages/redis/connection.py", line 700, in <lambda>
    lambda: self._connect(), lambda error: self.disconnect(error)
  File "/usr/local/lib/python3.10/site-packages/redis/connection.py", line 970, in _connect
    for res in socket.getaddrinfo(
  File "/usr/local/lib/python3.10/socket.py", line 955, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name does not resolve

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 472, in _reraise_as_library_errors
    yield
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 459, in _ensure_connection
    return retry_over_time(
  File "/usr/local/lib/python3.10/site-packages/kombu/utils/functional.py", line 318, in retry_over_time
    return fun(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 941, in _connection_factory
    self._connection = self._establish_connection()
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 867, in _establish_connection
    conn = self.transport.establish_connection()
  File "/usr/local/lib/python3.10/site-packages/kombu/transport/virtual/base.py", line 975, in establish_connection
    self._avail_channels.append(self.create_channel(self))
  File "/usr/local/lib/python3.10/site-packages/kombu/transport/virtual/base.py", line 953, in create_channel
    channel = self.Channel(connection)
  File "/usr/local/lib/python3.10/site-packages/kombu/transport/redis.py", line 741, in __init__
    self.client.ping()
  File "/usr/local/lib/python3.10/site-packages/redis/commands/core.py", line 1205, in ping
    return self.execute_command("PING", **kwargs)
  File "/usr/local/lib/python3.10/site-packages/redis/client.py", line 1266, in execute_command
    conn = self.connection or pool.get_connection(command_name, **options)
  File "/usr/local/lib/python3.10/site-packages/redis/connection.py", line 1457, in get_connection
    connection.connect()
  File "/usr/local/lib/python3.10/site-packages/redis/connection.py", line 705, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error -2 connecting to redis:6379. Name does not resolve.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/code/core/sources/tests/tests.py", line 920, in test_clone_with_cascade
    added_concepts, added_mappings = source2.clone_with_cascade(
  File "/code/core/sources/models.py", line 456, in clone_with_cascade
    return self.clone_resources(user, concepts, mappings, **kwargs)
  File "/code/core/sources/models.py", line 415, in clone_resources
    added_mappings += self.clone_mappings(
  File "/code/core/sources/models.py", line 474, in clone_mappings
    self._clone_resource(mapping, user)
  File "/code/core/sources/models.py", line 501, in _clone_resource
    resource.save_cloned()
  File "/code/core/mappings/models.py", line 401, in save_cloned
    self.index_from_concept()
  File "/code/core/mappings/models.py", line 409, in index_from_concept
    batch_index_resources.delay(
  File "/usr/local/lib/python3.10/site-packages/celery/app/task.py", line 425, in delay
    return self.apply_async(args, kwargs)
  File "/usr/local/lib/python3.10/site-packages/celery/app/task.py", line 575, in apply_async
    return app.send_task(
  File "/usr/local/lib/python3.10/site-packages/celery/app/base.py", line 788, in send_task
    amqp.send_task_message(P, name, message, **options)
  File "/usr/local/lib/python3.10/site-packages/celery/app/amqp.py", line 510, in send_task_message
    ret = producer.publish(
  File "/usr/local/lib/python3.10/site-packages/kombu/messaging.py", line 186, in publish
    return _publish(
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 563, in _ensured
    return fun(*args, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/kombu/messaging.py", line 195, in _publish
    channel = self.channel
  File "/usr/local/lib/python3.10/site-packages/kombu/messaging.py", line 218, in _get_channel
    channel = self._channel = channel()
  File "/usr/local/lib/python3.10/site-packages/kombu/utils/functional.py", line 34, in __call__
    value = self.__value__ = self.__contract__()
  File "/usr/local/lib/python3.10/site-packages/kombu/messaging.py", line 234, in <lambda>
    channel = ChannelPromise(lambda: connection.default_channel)
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 960, in default_channel
    self._ensure_connection(**conn_opts)
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 458, in _ensure_connection
    with ctx():
  File "/usr/local/lib/python3.10/contextlib.py", line 153, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/usr/local/lib/python3.10/site-packages/kombu/connection.py", line 476, in _reraise_as_library_errors
    raise ConnectionError(str(exc)) from exc
kombu.exceptions.OperationalError: Error -2 connecting to redis:6379. Name does not resolve.

----------------------------------------------------------------------
Ran 792 tests in 803.487s

FAILED (errors=10)
Preserving test database for alias 'default' ('test_postgres')...
1
Stopping ocl-oclapi2-rt_db_1 ...
Stopping ocl-oclapi2-rt_es_1 ...
Stopping ocl-oclapi2-rt_db_1 ... done
Stopping ocl-oclapi2-rt_es_1 ... done
Removing ocl-oclapi2-rt_db_1 ...
Removing ocl-oclapi2-rt_es_1 ...
Removing ocl-oclapi2-rt_es_1 ... done
Removing ocl-oclapi2-rt_db_1 ... done
Removing network ocl-oclapi2-rt_default
Removing volume ocl-oclapi2-rt_postgres-data
Removing volume ocl-oclapi2-rt_es-data