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| openstackgerrit | Liang Cui proposed openstack/aodh master: Replace test.attr with decorators.attr https://review.openstack.org/468351 | 10:28 |
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| ioggstream | hi dr_gogeta86: | 12:58 |
| ioggstream | dr_gogeta86: sileht gordc hi, about https://review.openstack.org/#/c/465499/ (increase sample frequency to 1/300 ) we probably need to change https://github.com/openstack/gnocchi/blob/stable/3.1/gnocchi/cli.py#L154 too | 13:01 |
| gordc | ioggstream: why is this? | 13:03 |
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| ioggstream | gordc: the default number of worker should fit the increased load, right? | 13:05 |
| ioggstream | the default frequency was 1/600. Me and dr_gogeta86 modified it to 1/300 according to the linked patch | 13:05 |
| ioggstream | and experienced a long backlog of metric processing | 13:06 |
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| gordc | ioggstream: possibly? so the issue is that the optimal value for that number is based on: sample frequency vs metricd workers vs metricd processing efficiency | 13:07 |
| gordc | (it's complicated) | 13:07 |
| gordc | i should note that number doesn't exist in gnocchi4 so it's not relevant to master | 13:08 |
| ioggstream | gordc: ok for gnocchi4. We are on newton ;) | 13:09 |
| gordc | the alternative is we can: a) write a note in docs imforming people that they might need to change that value in gnocchi3, b) add a config option specific to gnocchi3 or both | 13:09 |
| ioggstream | gordc: as the default is changed, I was guessing if it has impacts on other default params too | 13:09 |
| gordc | gnocchi isn't actually tied openstack release cycle... ie similar to how you don't have a newton mysql release. | 13:09 |
| gordc | if you can run gnocchi3.1, you can use exact same ceilometer code and target gnocchi4 (iirc) | 13:10 |
| ioggstream | gordc: yep, but I'm on rhosp10 :D | 13:10 |
| gordc | ioggstream: i think the TASKS_PER_WORKER value will affect the metric_processing_delay value | 13:11 |
| gordc | ioggstream: tell pradk to get gnocchi4 packaged :P (even though we didn't release gnocchi4 yet | 13:11 |
| ioggstream | gordc: so in the future release of gnocchi, should we take into account of the new default value of 300sec for any of the default params? | 13:12 |
| gordc | if you increase TASKS_PER_WORKER and your backlog state is good, you will need to increase metric_processing_delay | 13:12 |
| ioggstream | gordc: ok, so it's two parameters to modify dr_gogeta86 | 13:13 |
| gordc | if you increase TASKS_PER_WORKER and your backlog state is bad, you might want to decresae metric_processing_delay | 13:13 |
| ioggstream | gordc: while the polling.yaml change doesn't need any changes in the latest gnocchi release, right? | 13:13 |
| gordc | the scheduling for the ceph driver in gnocchi3 i didn't realise was effected by backlog (my testing always had enough workers so it never got extremely overloaded) | 13:14 |
| gordc | lastest gnocchi release meaning gnocchi4? | 13:15 |
| ioggstream | I mean whatever version will be tied to the new polling interval | 13:16 |
| ioggstream | ;) | 13:16 |
| ioggstream | actually the gnocchi expert is dr_gogeta86, I'm just the user of the metric | 13:16 |
| gordc | polling interval is independent of gnocchi. it's a ceilometer metric generation value | 13:16 |
| ioggstream | I just wanted to be sure that the pipeline.yaml changes didn't require any changes elsewhere | 13:17 |
| gordc | it will just generate metrics more frequently (it's something you should be configuring to fit your requirements) | 13:17 |
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| ioggstream | gordc: ok, that's great. so no impacts ;) | 13:19 |
| gordc | it will impact gnocchi4 less... i did a test where i created a backlog of 35M measurements and 40K metrics and it cleared it up pretty quickly (ceph driver) | 13:19 |
| ioggstream | can I ask how many worker do you have ? | 13:20 |
| gordc | but you probably don't want to let your backlog grow that big (was just testing some catastrophic scenario) | 13:20 |
| gordc | right now i'm working against a local 20OSD ceph env, 18 metricd workers, 32 api workers | 13:21 |
| gordc | all gnocchi services under one machine. | 13:21 |
| ioggstream | :DDD be assured I won't make any change :P | 13:22 |
| gordc | ioggstream: here you go: https://www.slideshare.net/GordonChung/gnocchi-v4-preview/#10 | 13:22 |
| ioggstream | just collecting all the stuff to argument with rh engineering the change we made | 13:22 |
| ioggstream | and possibly have them integrated in newton rpms | 13:23 |
| gordc | ioggstream: https://www.slideshare.net/GordonChung/gnocchi-v4-preview/#8 what i used to test v3 (so i had more HW in v3 test) | 13:23 |
| ioggstream | linked, thx++ | 13:24 |
| gordc | np | 13:24 |
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| openstackgerrit | Merged openstack/panko master: storage: Ensure pymysql is prefered https://review.openstack.org/468135 | 15:55 |
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| openstackgerrit | gordon chung proposed openstack/ceilometer stable/newton: clean up obs install instruction https://review.openstack.org/468468 | 16:37 |
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| openstackgerrit | Matt Wisch proposed openstack/ceilometer master: Added Nova Compute CPU metrics to gnocchi_resources.yaml https://review.openstack.org/468522 | 19:32 |
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| openstackgerrit | gordon chung proposed openstack/ceilometer stable/newton: add ceilometer storage disclaimer https://review.openstack.org/468467 | 20:35 |
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