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please ditch fcache as it does not work with multiprocessing on Windows #303

@masariello

Description

@masariello

Describe the bug

fcache has a known issue with multiprocessing (tsroten/fcache#26) that has been ignored tor 5 years.

Here's an example of the errors

2024-03-06 10:54:33.478 - ERROR - apscheduler.executors.unleash_executor_YTIN7P - run_job - Job "fetch_and_load_features (trigger: interval[0:01:00], next run at: 2024-03-06 10:55:32 CST)" raised an exception
Traceback (most recent call last):
  File "C:\Users\userName\AppData\Roaming\Python\Python39\site-packages\apscheduler\executors\base.py", line 125, in run_job
    retval = job.func(*job.args, **job.kwargs)
  File "C:\Users\dchuserNameoi\AppData\Roaming\Python\Python39\site-packages\UnleashClient\periodic_tasks\fetch_and_load.py", line 43, in fetch_and_load_features
    cache.set(ETAG, etag)
  File "C:\Users\userName\AppData\Roaming\Python\Python39\site-packages\UnleashClient\cache.py", line 129, in set
    self._cache[key] = value
  File "C:\Users\userName\AppData\Roaming\Python\Python39\site-packages\fcache\cache.py", line 267, in __setitem__
    self._write_to_file(filename, value)
  File "C:\Users\userName\AppData\Roaming\Python\Python39\site-packages\fcache\cache.py", line 254, in _write_to_file
    os.chmod(filename, self._mode)
OSError: [WinError 6800] The function attempted to use a name that is reserved for use by another transaction: 'C:\\Users\\userName\\AppData\\Local\\PROD\\PROD\\Cache\\cache\\65746167'

To Reproduce

Please see StackOverflow linked in tsroten/fcache#26

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