[Maas-devel] RFC: "Serialising" power actions
Mark Shuttleworth
mark at ubuntu.com
Tue Sep 23 09:44:21 UTC 2014
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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