Hi
I'd like to better understand the differences between the spooler and mules.
I have a Python webapp where I need to execute some cron jobs in the
background, outside the main workers. I see that I can use the target= argument
of the @cron decorator (undocumented, by the way) with a value of "spooler" or
"mule".
What's the difference between using the spooler vs. a mule? (or N spooler
processes vs. N mules) As far as I can see, the spooler has a directory of
tasks, so it can queue a large number of them and the queue survives a restart.
With mules, on the other hand, a signal is only answered if there is a free
mule when the signal is sent. Is this correct? What happens to a @cron with
target=mule if all the mules are busy? Is it just dropped?
Therefore, what is the best way to avoid having two instances of the same cron
overlap? Say I have a cron every 10 minutes, but if it takes more than 10
minutes, I don't want a second instance overlapping the first. I can use a
numbered mule, dedicated to that cron, so that the signal is dropped if the
mule is still busy. Is this correct?
Is there a way to disallow cron overlapping, using the spooler?
Is there a way to give names to the mules? Or are the names fixed to mule1,
mule2…?
Thanks,
Tobia
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