On Thu, 12 Feb 2015, Clint Byrum wrote:
I wonder how hard it would be to push Ceilometer down the road of being an OpenStack shim for collectd instead of a full implementation. This would make the problem above go away, as collectd is written in C and is well known to be highly optimized for exactly this type of workload.
I think this otherwise interesting idea jumps the gun a bit in a few different ways. * We first need to identify what people are actually hoping to do with Ceilometer or something like it. In this thread alone we've got talk of metering, billing, rating, monitoring, alarming/auto-scaling without any of those terms being very well defined. It's obvious that any one service is not going to be able to do all of those things well but it is not obvious how, without defining the terms, we can figure out how to do some small number of them well. * We also need to identify the parts of Ceilometer that are uniquely useful. That is what parts of it are not otherwise covered by existing tools that have an associated healthy opensource ecosystem. I'm not really sure the answer to this but to toss out some ideas: The things that Ceilometer has that make it special are the polling and notification agents and the associated pipeline. These are the parts that gather and transform events and meters that are unique to the openstack environment. (Curiously the gatherers are also the parts of Ceilometer that I think should be in the repos of other projects as plugins which generate notifications but that's a different topic.) Gnocchi is very interesting because it follows what has become a time honored style in OpenStack: Create an abstraction layer over a relatively small area of purpose and provide an easy to replace default driver. It also does this in a context that is independent from Ceilometer. This could get us a few things: * An improvable storage and reporting backend for Ceilometer that can evolve separately from Ceilometer. * A way to shrink Ceilometer itself so that it can become more narrowly focused on whatever its core purpose is defined to be. This is not that complex of a task: Ceilometer is already structured such that it is quite straightforward to send the results of the pipeline wherever we like. Gnocchi is one such destination. But again: We first need to figure out what people actually want to do and care about. -- Chris Dent tw:@anticdent freenode:cdent https://tank.peermore.com/tanks/cdent _______________________________________________ OpenStack-operators mailing list OpenStack-operators@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
