[Maas-devel] RFC: "Serialising" power actions

[Mark Shuttleworth]

On 16/09/14 01:13, Julian Edwards wrote:
> Queuing them up is a terrible solution, as we found when using Celery before 
> adding a deadline to the tasks.  They can pile up and cause a node to flip-
> flop.

The queue was not the problem. The problems were:

 * the queue was invisible
 * there was no way to know that things were queued up
 & there was no way to go fix the queue

celery's fire-and-forget design made that inevitable; a proper queue
gives you visibility and control.

Mark

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