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| openstackgerrit | Merged openstack/ha-guide: Updated from openstack-manuals https://review.openstack.org/257164 | 07:30 |
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| aspiers | morning :) | 08:53 |
| aspiers | (or evening) | 08:53 |
| masahito | good morning and evening :) | 08:55 |
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| ddeja | aspiers: I wanted to bring one topic on meeting, but we've run out of time | 10:04 |
| ddeja | So we can add this to agenda for next week? | 10:04 |
| aspiers | yep? | 10:04 |
| aspiers | sure | 10:04 |
| ddeja | Ok | 10:04 |
| aspiers | feel free to edit https://wiki.openstack.org/wiki/Meetings/HATeamMeeting | 10:04 |
| ddeja | OK | 10:04 |
| ddeja | Just short description: Let's assume that we have 6 computes | 10:05 |
| ddeja | load for about 75% | 10:05 |
| ddeja | and 3 of them dies - which VMs we want to evacuate | 10:05 |
| ddeja | and how to choose pets ;) | 10:05 |
| aspiers | that's where I see Congress being really helpful | 10:06 |
| aspiers | there is no single right approach across all clouuds | 10:06 |
| aspiers | it needs to be policy-based | 10:06 |
| ddeja | I know, but I'm wondering about another problem | 10:06 |
| aspiers | Congress gives the opportunity to control which hosts/VMs Mistral evacuates first | 10:07 |
| ddeja | becouse right now we will fire up 3 evacuation processes | 10:07 |
| ddeja | and we have to find a way to synchronize those evacuations | 10:07 |
| ddeja | because we may want to evacuate some from host A, some from HostB and so one | 10:08 |
| ddeja | having in mind limited resources | 10:08 |
| masahito | ddeja: IMO, we have 2 approach. | 10:08 |
| ddeja | and maybe killing some instances on alive hosts, to make place for VIVs (Very Important VMs) :) | 10:08 |
| aspiers | ddeja: yes, I agree this is a challenge | 10:09 |
| aspiers | although to some extent OpenStack (especially nova-scheduler) should handle the synchronization for us | 10:09 |
| masahito | If a cloud is allow over commit, we can move all VMs. If not allowed, we only choose priority VMs. | 10:09 |
| aspiers | masahito: priority VMs should always be resurrected first IMHO | 10:10 |
| ddeja | aspiers: Nova-scheduler wouldn't handle, since we avacuate all VMs one-by-one | 10:10 |
| aspiers | ddeja: why is that a problem? | 10:11 |
| aspiers | as long as markdown API can be used in parallel | 10:11 |
| ddeja | Let's assume that on compute 1 we have VMS with priority 1,2,3 and on compute 2 1,3,3 | 10:11 |
| aspiers | ok | 10:11 |
| ddeja | both dies, and on compute 3 we have place for 3 vms | 10:12 |
| ddeja | so if evacuate form ompute 2 will be fast, it vm's may be evacuated faster then those from compute 1 | 10:12 |
| aspiers | I see the proble | 10:12 |
| aspiers | problem | 10:12 |
| aspiers | but there is a tradeoff | 10:12 |
| aspiers | e.g. what if compute1 dies 5 seconds after compute2? | 10:13 |
| aspiers | or 10 seconds? 20 seconds? | 10:13 |
| ddeja | that's what me and _gryf hit todays morning ;) | 10:13 |
| aspiers | we can aggregate resurrection tasks into time buckets if we want | 10:13 |
| aspiers | but the bigger the bucket, the slower the resurrection | 10:13 |
| aspiers | and the smaller the bucket, the greater the risk of priority inversion | 10:14 |
| ddeja | maybe it will be good idea to prioritize over whole cloud | 10:14 |
| aspiers | (BTW I mean something different to classic kernel-level priority inversion) | 10:14 |
| ddeja | so in case of failure we can even kill some low priority VM | 10:14 |
| ddeja | aspiers: me too ;) | 10:14 |
| aspiers | ddeja: yes, Congress could definitely have policies about VM priority | 10:15 |
| aspiers | ddeja: I guess you could hardcode such a policy into Mistral for now | 10:15 |
| aspiers | and then we could move it into Congress later | 10:16 |
| aspiers | sounds like a longer-term goal to get this right | 10:16 |
| ddeja | aspiers: agree | 10:16 |
| ddeja | hmm, so I don't know if there is still need to put it on agenda for next week ;) | 10:17 |
| masahito | aspiers: ddeja: agree, from Congress dev side ;) | 10:17 |
| aspiers | ddeja: hehe :) | 10:17 |
| aspiers | ddeja: well you can at least give a status update summarising this conversation ;-) | 10:17 |
| ddeja | OK | 10:18 |
| aspiers | masahito: :) | 10:18 |
| aspiers | btw do you know if there is a blueprint for mistral HA yet? | 10:18 |
| aspiers | and same question for Congress HA | 10:18 |
| ddeja | aspiers: I don't think so | 10:18 |
| masahito | aspiers: what's for? | 10:19 |
| ddeja | on last Mistral meeting they've said it's still not started | 10:19 |
| ddeja | And guy how's supossed to do it was working on critical bug, so I don't know if it already started or not | 10:20 |
| ddeja | Will know after todays meeting (and probalby offer my help, if it's still not started) | 10:20 |
| masahito | oops, your question would be for Congress HA. | 10:20 |
| masahito | Congress has already had its HA feature. | 10:21 |
| aspiers | ddeja: ok thanks | 10:21 |
| aspiers | masahito: ah ok, nice | 10:21 |
| masahito | And for Mitaka, we try to separate a process to non-state process and state full process like other project do. | 10:23 |
| aspiers | makes sense | 10:35 |
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| openstackgerrit | KATO Tomoyuki proposed openstack/ha-guide: Update the overview of keepalived and pacemaker HA https://review.openstack.org/247887 | 22:16 |
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