Open Stack

Between patch set 1 and patch set 3 here [1] we have different solutions 
to the same issue, which is if you don't specify a spacing value for 
periodic tasks then they run whenever the periodic task processor runs, 
which is non-deterministic and can be staggered if some tasks don't 
complete in a reasonable amount of time.

I'm bringing this to the mailing list to see if there are more opinions 
out there, especially from operators, since patch set 1 changes the 
default behavior to have the spacing value be the DEFAULT_INTERVAL 
(hard-coded 60 seconds) versus patch set 3 which makes that behavior 
configurable so the admin can set global default spacing for tasks, but 
defaults to the current behavior of running every time if not specified.

I don't like a new config option, but I'm also not crazy about changing 
existing behavior without consensus.

[1] https://review.openstack.org/#/c/93767/

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Thanks,

Matt Riedemann