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| openstackgerrit | James Gu proposed openstack/monasca-persister master: Cassandra db support https://review.openstack.org/500125 | 07:25 |
|---|---|---|
| openstackgerrit | James Gu proposed openstack/monasca-api master: support cassandra db in devstack https://review.openstack.org/500123 | 07:33 |
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| openstackgerrit | Adrian Czarnecki proposed openstack/monasca-events-api master: WIP: Add events endpoint https://review.openstack.org/494223 | 12:39 |
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| openstackgerrit | Witold Bedyk proposed openstack/monasca-specs master: Define repository structure https://review.openstack.org/504108 | 16:25 |
| jgu_ | I am a little puzzled by the meaning of limit and offset in the list measurements api query when multiple unique metrics matching the criteria? is the limit intended for each unique metric or combined measurements for all? | 16:50 |
| rbrndt | jgu_ : Limit applies to the total set of measurements returned | 16:52 |
| jgu_ | rbrndt : that makes sense using together with the single offset. do you know anyone uses the multiple metric measurement query? the targeted use cases? | 16:56 |
| rbrndt | jgu_ when you say the multiple metrics query, what are you referring to? | 16:57 |
| rbrndt | do you mean '--group_by' or '--merge'? | 16:57 |
| jgu_ | yes, when the criteria by metric name and dimension will find multiple unique metric definitions | 16:59 |
| rbrndt | that alone results in an error, you need either --group_by or --merge to get data | 16:59 |
| jgu_ | yes I meant with the merge flag. | 16:59 |
| rbrndt | The merge query has a few different uses, including if a dimension changes | 17:00 |
| jgu_ | do you mean it is essentially the same metric but its dimension name or value changed? | 17:01 |
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| rbrndt | Yeah, like if a vm migrated to a different host | 17:01 |
| rbrndt | the dimension might change, but the metric stream is really the same | 17:02 |
| rbrndt | Alternatively, it allows different calculations with the statistics call | 17:02 |
| rbrndt | if you want to know an average over all your vas, you use --merge | 17:02 |
| rbrndt | vas->vms | 17:02 |
| jgu_ | both are pretty interesting use cases! | 17:04 |
| rbrndt | Are you looking to make modifications? | 17:04 |
| jgu_ | no, I am trying to support the merge/group by use cases in Cassandra. | 17:05 |
| jgu_ | this part is going to cause a lot of headache | 17:05 |
| jgu_ | :-) | 17:06 |
| rbrndt | Yeah, I can imagine. It's not ideal in Influx either | 17:06 |
| rbrndt | we actually have to pull all the data in and paginate in the API, not great | 17:06 |
| rbrndt | could be worth bringing up in a meeting some time, possibly changing the way limit and offset work for metrics | 17:07 |
| rbrndt | sorry, measurements I mean | 17:07 |
| jgu_ | I am facing the same issue | 17:07 |
| jgu_ | what are you suggesting changing the way limit and offset works for measurements? | 17:07 |
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| jgu_ | was there any discussions previously? | 17:09 |
| rbrndt | There were, but they included desire to match vertica | 17:23 |
| rbrndt | since vertica is not as much of a concern now, it may be time to reopen it | 17:24 |
| rbrndt | jgu_ ^^^ | 17:24 |
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