Thanks for the discussion. 

The problem with doing the image pull beforehand is that it his hard to 
predict if and when a certain blackbox action is really invoked. To shift 
the pul to create time the controller could execute a newly created 
blackbox action as kind of NOP on the home invoker, but we haven't looked 
in detail into those strategies. Besides this we also encountered 
situations were we observed a high degree of forced completion acks in our 
system that were not forced by image pulls.

For now I will prepare a PR to make the constant duration of 1 minute that 
is currently used in the code configurable.



> Makes sense to me also.

> Docker images are also not capped and always pulled on demand. Have you
> considered an alternate and more efficient management strategy that 
shifts
> the pulls to create time perhaps?



Mit freundlichen Gruessen / Kind regards
Steffen Rost
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