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Hello, we started to work on this, but before we go too far we'd like to
check if that's the right approach, I'm attaching a small patch.
Thanks,
		vds

On 11/07/2012 02:29 PM, Domas Monkus wrote:
> Hello,
> I have found the following wish-list item in the ceilometer project:
> https://bugs.launchpad.net/ceilometer/+bug/1010037
> 
> I have read the associated email thread [1] and launchpad blueprint [2],
> however, the task still seems in need of further discussions. To be more
> exact, there are a few things that are still unclear:
> 
> 1. How should pollster-specific polling intervals be specified? The
> blueprint mentions that publishers (I assume it means collectors) should
> specify the intervals, however I don't think that a communication
> channel between the collector and the central agent running the
> pollsters is in place.
> 
> 2. Should pollsters be able to specify a polling interval (perhaps an
> inherited default) to the central agent?
> 
> 3. If other ways of setting the polling intervals are probably possible
> (e.g. the config file), should there be a hierarchy specified of which
> setting override which ones?
> 
> 4. Should the current periodic_interval configuration value be used as a
> safe fall back for pollsters without explicitly defined values?
> 
> 5. What is the granularity of polling intervals? Seconds?
> 
> 
> And finally an implementation idea:
> I do not think that having separate periodic tasks for each pollster is
> the best solution for this problem. Assuming a second granularity for
> polling intervals, the central agent manager can maintain a map of
> pollsters and their intervals. As long as the manager is called with an
> interval that is a GCD of its pollster intervals, it can basically
> calculate how often each pollster should be queried.
> 
> Domas Monkus
> 
> [1] https://lists.launchpad.net/openstack/msg12916.html
> [2]
> https://blueprints.launchpad.net/ceilometer/+spec/publisher-counters-frequency
> 
> 
> 
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> 
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