Friday, 2017-05-26

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openstackgerritLiang Cui proposed openstack/aodh master: Replace test.attr with decorators.attr  https://review.openstack.org/46835110:28
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ioggstreamhi dr_gogeta86:12:58
ioggstreamdr_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 too13:01
gordcioggstream: why is this?13:03
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ioggstreamgordc: the default number of worker should fit the increased load, right?13:05
ioggstreamthe default frequency was 1/600.  Me and dr_gogeta86 modified it to 1/300 according to the linked patch13:05
ioggstreamand experienced a long backlog of metric processing13:06
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gordcioggstream: possibly? so the issue is that the optimal value for that number is based on: sample frequency vs metricd workers vs metricd processing efficiency13:07
gordc(it's complicated)13:07
gordci should note that number doesn't exist in gnocchi4 so it's not relevant to master13:08
ioggstreamgordc: ok for gnocchi4. We are on newton ;)13:09
gordcthe 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 both13:09
ioggstreamgordc: as the default is changed, I was guessing if it has impacts on other default params too13:09
gordcgnocchi isn't actually tied openstack release cycle... ie similar to how you don't have a newton mysql release.13:09
gordcif you can run gnocchi3.1, you can use exact same ceilometer code and target gnocchi4 (iirc)13:10
ioggstreamgordc: yep, but  I'm on rhosp10 :D13:10
gordcioggstream: i think the TASKS_PER_WORKER value will affect the metric_processing_delay value13:11
gordcioggstream: tell pradk to get gnocchi4 packaged :P (even though we didn't release gnocchi4 yet13:11
ioggstreamgordc: 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
gordcif you increase TASKS_PER_WORKER and your backlog state is good, you will need to increase metric_processing_delay13:12
ioggstreamgordc: ok, so it's two parameters to modify dr_gogeta8613:13
gordcif you increase TASKS_PER_WORKER and your backlog state is bad, you might want to decresae metric_processing_delay13:13
ioggstreamgordc: while the polling.yaml change doesn't need any changes in the latest gnocchi release, right?13:13
gordcthe 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
gordclastest gnocchi release meaning gnocchi4?13:15
ioggstreamI mean whatever version will be tied to  the new polling interval13:16
ioggstream;)13:16
ioggstreamactually the gnocchi expert is dr_gogeta86, I'm just the user of the metric13:16
gordcpolling interval is independent of gnocchi. it's a ceilometer metric generation value13:16
ioggstreamI just wanted to be sure that the pipeline.yaml changes didn't require any changes elsewhere13:17
gordcit will just generate metrics more frequently (it's something you should be configuring to fit your requirements)13:17
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ioggstreamgordc: ok, that's great. so no impacts ;)13:19
gordcit 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
ioggstreamcan I ask how many worker do you have ?13:20
gordcbut you probably don't want to let your backlog grow that big (was just testing some catastrophic scenario)13:20
gordcright now i'm working against a local 20OSD ceph env, 18 metricd workers, 32 api workers13:21
gordcall gnocchi services under one machine.13:21
ioggstream:DDD be assured I won't make any change :P13:22
gordcioggstream: here you go: https://www.slideshare.net/GordonChung/gnocchi-v4-preview/#1013:22
ioggstreamjust collecting all the stuff to argument with rh engineering the change we made13:22
ioggstreamand possibly have them integrated in newton rpms13:23
gordcioggstream: 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
ioggstreamlinked, thx++13:24
gordcnp13:24
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openstackgerritMerged openstack/panko master: storage: Ensure pymysql is prefered  https://review.openstack.org/46813515:55
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openstackgerritgordon chung proposed openstack/ceilometer stable/newton: add ceilometer storage disclaimer  https://review.openstack.org/46846716:32
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openstackgerritgordon chung proposed openstack/ceilometer stable/newton: clean up obs install instruction  https://review.openstack.org/46846816:37
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openstackgerritMatt Wisch proposed openstack/ceilometer master: Added Nova Compute CPU metrics to gnocchi_resources.yaml  https://review.openstack.org/46852219:32
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openstackgerritgordon chung proposed openstack/ceilometer stable/newton: add ceilometer storage disclaimer  https://review.openstack.org/46846720:35
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