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I created a pull request into development branch. @mitar, can you take a look and comment on?
So this is good enough for now, but it is not ideal. In production we are running multiple processes in parallel, so a global variable is not shared among them. I am just working on a task queue to run such and similar tasks through a distributed set of workers. I will add to feature list of what task queue has to support to support tasks where only one can be in parallel.