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| klindgren_ | mriedem, how often are compute nodes suppose to check in to the placement API? asking because it seems like every vm check internval it updates placement ip. Every min, with ~5 calls per HV? Seems like that will quickly turn terrible at scale? | 00:13 |
|---|---|---|
| mriedem | klindgren_: the compute node provider inventory is updated in placement (if the inventory has changed) every time the update_available_resources periodic task runs | 00:39 |
| mriedem | same as updating the compute_nodes table in the same periodic | 00:40 |
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| klindgren_ | So its done over rest vs's rpc? | 00:40 |
| mriedem | yes | 00:41 |
| klindgren_ | Just noticed once I got that working in my cell of 1 compute node, 5+ calls to placement every minute | 00:41 |
| mriedem | which release? | 00:41 |
| mriedem | ocata? | 00:41 |
| klindgren_ | having done something similar for vms to poll into metadata services, to do somethings... that seemed risky. | 00:41 |
| klindgren_ | pike | 00:41 |
| mriedem | i don't know what all of those 5 calls are without auditing it, but know there would at least be a GET on the resource provider for that compute node, and a GET on the inventories for that provider, and a PUT on the inventories for that provider if inventory changed since the last check | 00:42 |
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| mriedem | placement has to be over rest so it can be it's own service and things external to nova can use it | 00:44 |
| mriedem | if it were over rpc, you'd likely have scaling adjustments to make for the increased rpc load right? | 00:44 |
| mriedem | i don't doubt there are probably areas that we can optimize, we've mostly been in "get things working" for a few releases now | 00:45 |
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| klindgren_ | https://paste.ubuntu.com/26356656/ | 00:47 |
| mriedem | we likely don't need to be doing the aggregates ones yet, | 00:48 |
| mriedem | those are for shared resource, e.g. storage, providers but that doesn't work yet | 00:48 |
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| mriedem | klindgren_: https://github.com/openstack/nova/blob/stable/pike/nova/scheduler/client/report.py#L490 | 00:49 |
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| mriedem | and _provider_aggregate_map isn't used for anything | 00:50 |
| mriedem | so likely something we should nix in master and backport until we actually need to use it | 00:50 |
| mriedem | or as that note says, put it on a cache with a refresh interval | 00:51 |
| klindgren_ | it based upon agent down time? - figured it would have been based upon the report internval? | 00:52 |
| mriedem | huh? | 00:56 |
| mriedem | klindgren_: you want to report a bug about the useless aggregates GET calls in the report client? | 00:56 |
| klindgren_ | no sorry - if I wanted to change the interval from every minute to say 2 minutes | 00:56 |
| klindgren_ | how would one go about doing that | 00:57 |
| mriedem | it's the update_available_resources periodic in compute | 00:57 |
| mriedem | https://github.com/openstack/nova/blob/stable/pike/nova/compute/manager.py#L6717 | 00:57 |
| mriedem | "update_resources_interval" config option | 00:57 |
| mriedem | note that the RT code is still going to run whenever instances change on the host though, like create/delete/move | 00:58 |
| klindgren_ | - I swore I searched for all the internval config options | 00:58 |
| mriedem | search *harder*! | 00:58 |
| klindgren_ | yea thats fine | 00:58 |
| klindgren_ | haha | 00:58 |
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| mriedem | klindgren_: did you ever report a nova bug about the compute hitting the placement aggregates API unnecessarily? | 15:15 |
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| klindgren_ | mriedem, I did not - I can though | 17:30 |
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| mriedem | i created one | 17:31 |
| mriedem | https://bugs.launchpad.net/nova/+bug/1742467 | 17:32 |
| openstack | Launchpad bug 1742467 in OpenStack Compute (nova) "Compute unnecessarily gets resource provider aggregates during every update_available_resource run" [Medium,Triaged] | 17:32 |
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| klindgren_ | Awesome | 17:38 |
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| klindgren_ | mriedem, just wanted to let you know that I got a pike cellsv2 cloud working. Also with routed network creating segments within nova and placement of those resources working correctly. Right now its a cell of 1 compute node. but.... it works. | 20:38 |
| klindgren_ | All without any local patches. | 20:39 |
| mriedem | klindgren_: nice! | 20:41 |
| mriedem | dansmith: ^ | 20:41 |
| dansmith | um | 20:41 |
| mriedem | klindgren_: are you doing routed networks with the deferred IP allocation stuff? | 20:41 |
| dansmith | one cell of one compute? | 20:41 |
| dansmith | or multiple cells with one compute each? | 20:41 |
| mriedem | dansmith: yes, it's single node devstack, but... | 20:41 |
| klindgren_ | actaully its deploying kolla containers using custom ansible stuff we wrote... | 20:42 |
| dansmith | I'm just saying, I'll believe all the networking stuff works when it's multiple cells | 20:42 |
| klindgren_ | I have a few more computes to add and going to define another cell. But starting small... | 20:44 |
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| klindgren_ | @dansmith is their something specific you would like to see to confirm that it works? | 21:21 |
| klindgren_ | argh slack has runied me... | 21:23 |
| klindgren_ | dansmith, ^ | 21:23 |
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| klindgren_ | mriedem, I was noticing that during a cellv2 setup, that if you are using a list of rabbitmq hosts in the transport_url that when it does the cell add stuff (nova-manage cell_v2 create cell) without the transport-url defined on the command line. it only adds one of the rabbitmq servers that are defined in the url? I assume its one that it randomly selects from the list. Is this expected? | 21:49 |
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| mriedem | i wouldn't say it's expected | 21:53 |
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| mriedem | klindgren_: this is an older bug too that i never was able to figure out https://bugs.launchpad.net/nova/+bug/1717915 | 21:54 |
| openstack | Launchpad bug 1717915 in oslo.messaging "nova services and transport_url, cannot connect to vhost if specified" [Undecided,New] | 21:54 |
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| klindgren_ | we had a related issue in cellsv1 where the rabbitmq host list was set to a 255 character limit. | 21:54 |
| klindgren_ | which was awesome when it would just drop anything after 255 characters... | 21:55 |
| klindgren_ | only hada few outages due to that one | 21:55 |
| mgagne | ouch :-/ | 21:55 |
| mriedem | you'll be happy to know you get a TEXT field for the db and mq urls in the cell_mappings table :)_ https://github.com/openstack/nova/blob/master/nova/db/sqlalchemy/api_models.py#L118 | 21:55 |
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