Open Stack

On 19/11/15 10:26 PM, Srikanth Vavilapalli wrote:
>
> Hi Gord
>
> On your second point, Yes, Ceilometer does provide a framework to 
> capture a notification and republish to multiple “publish targets” in 
> addition to the collector service using udp/kafka/notification as the 
> transport mechanisms… We believe this is how “Event Alarm Evaluator” 
> module in Aodh project get notified directly from Notification Agents.
>
> However seems like the configuration of these additional “publish 
> targets” is supported only through updating the pipeline_cfg_file and 
> restarting the corresponding ceilometer services. i.e. the users need 
> to manually update the pipeline config files to insert their “publish 
> targets” in the sink-publisher configuration for a set of event 
> filters of their interest. This type of provisioning is very static.
>
> As per our understanding, ceilometer currently does not provide means 
> for users to dynamically register/unregister their “publish targets” 
> with ceilometer framework for a subset events of their interest? i.e 
> User invokes a ceilometer API with a set of event filters and 
> associated publish targets, that can be stored in a data store, which 
> will eventually be used by the ceilometer Publisher to dispatch the 
> notification to those configured destinations in addition to the 
> statically configured “publish targets”. Plz let us know if our 
> understanding is wrong or if there are any other means to achieve the 
> above functionality. We believe this as a very key functionality 
> needed to build latency sensitive (sub-second) analytics application 
> on-top of ceilometer framework. We are seeking the feedback from 
> community on having this kind of functionality inside ceilometer 
> before proceeding with blueprint submission.
>
actually, in Liberty you can configure a reload[1][2] to refresh 
pipeline when a change happens. based on survey results, most operators 
don't need this functionality so it's off by default but it seems you do. :)

[1] 
https://specs.openstack.org/openstack/ceilometer-specs/specs/liberty/reload-file-based-pipeline-configuration.html
[2] 
https://github.com/openstack/ceilometer/blob/master/ceilometer/pipeline.py#L50-L58

cheers,

-- 
gord

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