Issue 1:
Checklist

I have read the relevant section in the

contribution guide

on reporting bugs.

I have checked the issues list

for similar or identical bug reports.

I have checked the pull requests list

for existing proposed fixes.

I have checked the commit log

to find out if the bug was already fixed in the master branch.

I have included all related issues and possible duplicate issues

in this issue (If there are none, check this box anyway).

Mandatory Debugging Information

I have included the output of celery -A proj report in the issue.

(if you are not able to do this, then at least specify the Celery

version affected).

I have verified that the issue exists against the master branch of Celery.

I have included the contents of pip freeze in the issue.

I have included all the versions of all the external dependencies required

to reproduce this bug.

Optional Debugging Information

I have tried reproducing the issue on more than one Python version

and/or implementation.

I have tried reproducing the issue on more than one message broker and/or

result backend.

I have tried reproducing the issue on more than one version of the message

broker and/or result backend.

I have tried reproducing the issue on more than one operating system.

I have tried reproducing the issue on more than one workers pool.

I have tried reproducing the issue with autoscaling, retries,

ETA/Countdown & rate limits disabled.

I have tried reproducing the issue after downgrading

and/or upgrading Celery and its dependencies.

Related Issues and Possible Duplicates

Related Issues

#4454

Possible Duplicates

None

Environment & Settings

Celery version: 4.3.0 with fixes in PR #5527

celery report Output:

software -> celery:4.3.0 (rhubarb) kombu:4.6.4 py:3.7.4
billiard:3.6.1.0 py-amqp:2.5.1
platform -> system:Windows arch:64bit, WindowsPE
kernel version:10 imp:CPython
loader -> celery.loaders.default.Loader
settings -> transport:amqp results:disabled

Steps to Reproduce

Give Celery a Backend URL pointing to a MongoDB like below:

mongodb://admin:admin@192.168.0.1/task?authSource=admin&authMechanism=SCRAM-SHA-256

Start Celery worker.

Send any task.

Required Dependencies

Minimal Python Version: 3.0

Minimal Celery Version: 3.0

Minimal Kombu Version: Unknown

Minimal Broker Version: Unknown

Minimal Result Backend Version: MongoDB 4.0

Minimal OS and/or Kernel Version: N/A

Minimal Broker Client Version: Unknown

Minimal Result Backend Client Version: Unknown

Python Packages

pip freeze Output:

amqp==2.5.1
asn1crypto==0.24.0
astroid==2.2.5
bcrypt==3.1.7
billiard==3.6.1.0
celery==4.3.0
cffi==1.12.3
Click==7.0
colorama==0.4.1
cryptography==2.7
irectory=backend
Flask==1.1.1
importlib-metadata==0.19
isort==4.3.21
itsdangerous==1.1.0
Jinja2==2.10.1
kombu==4.6.4
lazy-object-proxy==1.4.2
MarkupSafe==1.1.1
mccabe==0.6.1
more-itertools==7.2.0
paramiko==2.6.0
pycparser==2.19
pylint==2.3.1
pymodm==0.4.1
pymongo==3.9.0
PyNaCl==1.3.0
pytz==2019.2
six==1.12.0
typed-ast==1.4.0
vine==1.3.0
Werkzeug==0.15.5
wrapt==1.11.2
zipp==0.6.0

Other Dependencies

MongoDB:

Version: >= 3.0.0

Minimally Reproducible Test Case

Expected Behavior

Support all the authentication options listed at authentication-options, including authSource, authMechanism, authMechanismProperties and gssapiServiceName.

Actual Behavior

An error occurred as below.

Traceback (most recent call last):
File "D:\GitHub\org\dev\.venv\lib\site-packages\kombu\utils\objects.py", line 42, in __get__
return obj.__dict__[self.__name__]
KeyError: 'collection'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\GitHub\org\dev\.venv\lib\site-packages\kombu\utils\objects.py", line 42, in __get__
return obj.__dict__[self.__name__]
KeyError: 'database'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "c:\Users\user\.vscode\extensions\ms-python.python-2019.9.34911\pythonFiles\ptvsd_launcher.py", line 43, in <module>
main(ptvsdArgs)
File "c:\Users\user\.vscode\extensions\ms-python.python-2019.9.34911\pythonFiles\lib\python\ptvsd\__main__.py", line 432, in main
run()
File "c:\Users\user\.vscode\extensions\ms-python.python-2019.9.34911\pythonFiles\lib\python\ptvsd\__main__.py", line 316, in run_file
runpy.run_path(target, run_name='__main__')
File "C:\Program Files\Python37\lib\runpy.py", line 263, in run_path
pkg_name=pkg_name, script_name=fname)
File "C:\Program Files\Python37\lib\runpy.py", line 96, in _run_module_code
mod_name, mod_spec, pkg_name, script_name)
File "C:\Program Files\Python37\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "d:\GitHub\org\dev\backend\tests\workertest.py", line 22, in <module>
print('Task finished? ', result.ready())
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\result.py", line 313, in ready
return self.state in self.backend.READY_STATES
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\result.py", line 473, in state
return self._get_task_meta()['status']
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\result.py", line 412, in _get_task_meta
return self._maybe_set_cache(self.backend.get_task_meta(self.id))
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\base.py", line 386, in get_task_meta
meta = self._get_task_meta_for(task_id)
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\mongodb.py", line 206, in _get_task_meta_for
obj = self.collection.find_one({'_id': task_id})
File "D:\GitHub\org\dev\.venv\lib\site-packages\kombu\utils\objects.py", line 44, in __get__
value = obj.__dict__[self.__name__] = self.__get(obj)
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\mongodb.py", line 293, in collection
collection = self.database[self.taskmeta_collection]
File "D:\GitHub\org\dev\.venv\lib\site-packages\kombu\utils\objects.py", line 44, in __get__
value = obj.__dict__[self.__name__] = self.__get(obj)
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\mongodb.py", line 288, in database
return self._get_database()
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\mongodb.py", line 271, in _get_database
conn = self._get_connection()
File "D:\GitHub\org\dev\.venv\lib\site-packages\celery\backends\mongodb.py", line 161, in _get_connection
self._connection = MongoClient(**conf)
File "D:\GitHub\org\dev\.venv\lib\site-packages\pymongo\mongo_client.py", line 668, in __init__
username, password, dbase, opts)
File "D:\GitHub\org\dev\.venv\lib\site-packages\pymongo\client_options.py", line 151, in __init__
username, password, database, options)
File "D:\GitHub\org\dev\.venv\lib\site-packages\pymongo\client_options.py", line 39, in _parse_credentials
mechanism, source, username, password, options, database)
File "D:\GitHub\org\dev\.venv\lib\site-packages\pymongo\auth.py", line 107, in _build_credentials_tuple
raise ConfigurationError("%s requires a username." % (mech,))
pymongo.errors.ConfigurationError: SCRAM-SHA-256 requires a username.

Issue 2:
Checklist

I have checked the issues list

for similar or identical feature requests.

I have checked the pull requests list

for existing proposed implementations of this feature.

I have checked the commit log

to find out if the same feature was already implemented in the

master branch.

I have included all related issues and possible duplicate issues

in this issue (If there are none, check this box anyway).

Related Issues and Possible Duplicates

Related Issues

None

Possible Duplicates

None

Brief Summary

NotImplementedError: <class 'celery.concurrency.gevent.TaskPool'> does not implement kill_job