Migrated issue, originally created by David Gardner ()

Ran into this issue in production where users were reporting items in the cache being an hour old for a cache region configured with a one minute expiration time. Problem first observed with version 0.5.7, and reproduced with version 0.6.1.

I was able to reproduce the issue in a simple test of a function that returns datetime.now() (dogpile-test.py), if I run about 10 concurrent instances of the script after about a minute or so they will start reporting stale data.

However I noticed as a work-around if I use the MutexLock class from the lock_factory documentation, I don't run into the problem:
http://dogpilecache.readthedocs.io/en/latest/api.html?highlight=dogpile.cache.dbm#dogpile.cache.backends.file.DBMBackend.params.lock_factory

Attachments: dogpile-test.py