Testing if datetime is aware fails about django-cron HOT 9 CLOSED

Resolved in #130

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@mikicz can I have a little more information about your implementation? I am having trouble replicating

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Hi, I think I just followed the tutorial and documentation and did no modyfing, this really occured once after many months of production runtime and never happen since, I don't know if its worth trying to replicate...

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I also just received this. Interesting,

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I think there is a race condition around lock release and lock acquisition failed message.

Say you have 2 processes trying to run the same job A and B

A. acquire lock
A. run job
B. acquire lock
A. release lock
B. read lock value

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I had this error occur today and wanted to say what I saw. I am using this on Windows through the task scheduler and have it set to run every 5 mins. For some reason, Windows did not run the script at 1:50 PM. I think it then tried to run it twice at 1:56 PM.

I also think that the first process messed up the second process in more than 1 way. It was trying to run a job at 1:50 PM that was scheduled for 4 AM. The only time I saw something like this happen, I had an issue with the backend (e.g. database was down so it attempted to run all of the jobs).

So, I guess what I am trying to say is that this issue may be with the OS or with the cache backend.

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We run a lot of jobs and I'm getting this error at least every day, sometimes multiple times a day. Any idea when this will be fixed in pip?

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@agronick do you have more than 1 process/server running the cron command?

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Just one but they run all the time. I think the problem is that maybe 1 out of every 500 jobs finishes between the time when that cache key is checked and when it is read the second time.

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