Monday, 2018-07-30

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efried#startmeeting nova_scheduler13:59
openstackMeeting started Mon Jul 30 13:59:59 2018 UTC and is due to finish in 60 minutes.  The chair is efried. Information about MeetBot at http://wiki.debian.org/MeetBot.14:00
openstackUseful Commands: #action #agreed #help #info #idea #link #topic #startvote.14:00
*** openstack changes topic to " (Meeting topic: nova_scheduler)"14:00
openstackThe meeting name has been set to 'nova_scheduler'14:00
takashino/14:00
tssuryao/14:00
alex_xuo/14:00
tetsuro_o/14:01
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jaypipeso/14:01
* bauzas waves14:01
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efriedOkay, let's get started.14:02
efried#topic last meeting14:02
efried#link last minutes: http://eavesdrop.openstack.org/meetings/nova_scheduler/2018/nova_scheduler.2018-07-23-14.00.html14:02
efriedAny old business?14:02
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cdento/14:02
efried#topic specs and review14:03
efried#link latest pupdate: http://lists.openstack.org/pipermail/openstack-dev/2018-July/132562.html14:03
*** openstack changes topic to "specs and review (Meeting topic: nova_scheduler)"14:03
efriedNow that we're past FF and the14:03
efried#link reshaper series: https://review.openstack.org/#/q/topic:bp/reshape-provider-tree+status:open14:03
efriedhas been deferred, I'm not completely sure what our priorities are supposed to be. Anyone?14:03
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efriedPerhaps a focus on14:04
efried#topic bugs14:04
efried#link placement bugs: https://bugs.launchpad.net/nova/+bugs?field.tag=placement&orderby=-id14:04
*** openstack changes topic to "bugs (Meeting topic: nova_scheduler)"14:04
efriedor14:05
efried#topic opens14:05
efriedPlanning/Doing support in nova/report client for:14:05
efried#link consumer generation handling (gibi): https://review.openstack.org/#/c/583667/14:05
efried?14:05
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efriedI, for one, would like to see the reshaper series finished and reviewed, ready for when we branch so we can land it in Stein first thing.14:05
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cdentI think this week it's all bugs?14:06
efriedokay then14:06
efriedIt would be nice to see some14:06
efriedPlanning/Doing support in nova/report client for:14:06
efriednested and shared providers for initial allocations14:06
efriednested and shared providers when modifying migration (and other?) allocations14:06
efriedas well.14:06
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efriedWe had some discussion last week about the sharing provider support we landed for libvirt. TL;DR: it's broke, so we ripped it out. See https://review.openstack.org/#/c/586614/ and https://bugs.launchpad.net/nova/+bug/178402014:07
openstackLaunchpad bug 1784020 in OpenStack Compute (nova) "Shared storage providers are not supported and will break things if used" [High,Triaged]14:07
efriedso it would be neat if we could try to work through some of that, but a lot of it is going to be Stein (and possibly beyond) blueprint work.14:08
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cdentYeah, I think we need to do some exploring and experimenting to make sure we really know what's going on14:09
efriedTests and CI jobs would be great.14:09
efriedAnyone have anything else? Specific bugs or topics to bring up? Open discussion?14:10
cdentJust a reminder for anyone to put stuff on https://etherpad.openstack.org/p/nova-ptg-stein14:11
jaypipesefried: so, the bugs on shared storage providers... are we not able to fix those in Rocky?14:11
efriedno way14:11
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efriedI should link the IRC discussion, stand by lemme find...14:11
cdentjaypipes: there was quite a bit of discussion on thursday and friday in irc about slow gateness and features not being quite there14:11
cdentwhich has resulted in a great deal of stuff being even less there14:12
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jaypipescdent: ok, yeah if anyone has links for me to read, that would be great. tia14:13
jaypipescurrently reading the bug report14:13
efriedThis is probably as good a place as any to start reading. Goes on for a while:14:13
efried#link IRC discussion about busted sharing provider support http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2018-07-27.log.html#t2018-07-27T14:43:3314:13
cdentmatt and dan may be able to give you a quick summary of their perspectives14:13
efriedThe bug report actually summarizes the issues pretty well.14:13
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efriedBut I was convinced it was going to be too much to qualify as "bug fixes" in rocky.14:14
efriedand I tend to be the optimistic one.14:14
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efriedDo we want to discuss further here? jaypipes cdent?14:15
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cdentI've got nothing to add at this time. I think after jaypipes has digested if we want to continue we can do it after the meeting14:16
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jaypipesefried: just disappointing to push it yet another release, but at this point, it's par for the course.14:16
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efriedI think good progress was made, but note that we explicitly made it not a priority for Queens and then never brought it back to the forefront for Rocky. So if nothing else, this is good reason for us to make it an explicit priority for Stein.14:17
efriedAnd to spec out exactly what we need to do to make it work and declare it done.14:18
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jaypipesefried: the way we handle migrations currently, I'm not sure there's ever going to be a solution to this :(14:19
jaypipesefried: at least, not as long as we can't tolerate doubling up allocations on shared storage for a brief period of time during migration.14:20
efriedjaypipes: Incremental progress. We can start by making sure allocations aren't lost/doubled. Then next step, making sure the same provider is picked on the target when it's available. Then making sure that's done without having doubled allocations. Then doing the migration without re-copying the disk contents.14:20
jaypipesefried: we go through all sorts of code gymnastics to cater to resize to same host shit.14:20
efriedI think if we spec it out, we'll be able to solve it.14:21
efried#link Stein PTG etherpad https://etherpad.openstack.org/p/nova-ptg-stein14:21
efriedL82 mriedem started some bullets around this.14:21
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jaypipesefried: doubling up allocations *should* be fine -- and standard practice during migrations. it is the fact that due to resize to same host and concerns about potentially running out of perceived disk space on a shared provider that we *don't* just always double shit up, right?14:21
efriedthat's not what's happening today14:22
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efriedI imagine there will be discussion about whether we prefer dest hosts sharing the same providers as existing allocations - I imagine the answer is yes - and then what we do if we can't find one of those. So maybe we ask for alloc candidates *excluding* shared resources but which are ?member_of the aggregate(s) of the sharing providers? And if that results in no hits, then we fall back to the regular thing and accept14:25
* jaypipes reading IRC backlog14:25
efriedSounds like ideal PTG whiteboard fodder.14:25
jaypipesefried: sounds way too complicated to be safe/clean. which is typically the case with anything migration-related...14:25
cdentdenver has all the best whiteboards upstairs, and none of them downstairs14:27
efriedThe alternative is not caring that we're asking for more resource than we actually need, and thus not being able to hit full utilization without incorrectly failing migrations...14:27
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efriedwhich may be okay as an incremental first step14:28
jaypipesefried: that is *precisely* what I just said above :)14:29
jaypipesefried: in other words, don't try to overthink things. just always create a doubled allocation during migration -- owned/consumed by the migration UUID.14:29
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jaypipesefried: and don't try to figure out whether there's a sharing provider in use or not.14:29
efriedYuh, what I'm saying is, once we've implemented that, let's not dust off our hands and quit trying to make it better.14:30
jaypipesefried: and on the rare occasion where the scheduler/placement returns no valid host due to exceeding capacity, then oh well...14:30
cdentbuy more disk14:31
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efriedSoooo, is someone going to start writing a spec?14:32
efriedmigration isn't the only issue in play14:32
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bauzaskeep in mind upgrades then ;)14:32
efried^14:32
bauzasor we would have yet another spec like reshape :)14:33
cdentefried: I'm unable to commit to anything like spec writing _now_14:33
cdentlater perhaps, but I need more mental headspace to do anything useful, and my backlog is way full14:34
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cdentI suspect that is the case for everyone14:34
jaypipesthe reshaper is the thing that is needed for sharing providers to be a completely automated setup.14:34
cdentwhile that's true, we'll just have to pass our apoligies downstream14:34
efriedThere was a discussion last week about process for big, multi-release features like this. It was suggested to have a high-level spec to describe things at the conceptual level and enumerate some of the components; and then single-release-contained specs for those components.14:34
jaypipeswe always said that when we added the sharing provider deletes DISK_GB inventory patch that the operator would be responsible for manually moving the DISK_GB allocation records from compute nodes onto the sharing provider. :(14:35
jaypipesI guess now we want to automate all of that.14:35
efriedWell, the op was responsible for creating the inv on the sharing provider. But the way we implemented the libvirt update_provider_tree, the driver "automatically" deleted it from the compute node.14:36
jaypipesgod forbid an operator needs to run a command to move data when they set up shared storage...14:36
bauzaswell14:36
bauzasidk14:36
efriedoh, allocation records, yeah14:37
jaypipesefried: yes, and auto-deleting that inventory record from the compute node would work just dandy if the operator had already moved the allocations to the shared storage provider. :(14:37
efriedDo we have osc-placement yet?14:37
efriedfor allocs14:37
bauzasnope AFAIK14:37
bauzaswe had a BZ about it14:37
cdentI thought we did?14:37
bauzas(internally)14:37
bauzasoh, okay14:37
bauzasfor deleting allocations ?14:37
jaypipesbauzas: we don't want to delete allocations. the solution agreed upon was using the replace-the-world reshaper for these kinds of maintenance events.14:38
bauzasbecause IIRC, the BZ reporter said he had to call the API directly for deleting allocs14:38
efriedHe would want to POST allocs.14:38
bauzasjaypipes: oh okay, if that's a design consensus :)14:39
efriedmove them from the compute node rp to the shared storage rp.14:39
bauzasI'm fine with it14:39
efriedBut yeah, reshaper could be used for this also.14:39
bauzastbc, the BZ wasn't about asking to create a osc-placement call for deleting allocs14:39
jaypipesefried: sharing storage providers was one of the primary use cases for reshaper...14:39
efriedum14:39
jaypipesI very specifically remember talking excitedly with cdent about using reshaper to "shape" a sharing provider world.14:39
efriedI mean, I can see how that would work, but I don't remember sharing being part of the discussions.14:40
jaypipesefried: the two primary use cases were NUMA-fying and sharing storage-ifying14:40
jaypipesefried: in any case, I also remember speaking about the need to move allocation records for DISK_GB to the sharing provider as a manual operator action14:41
efriedWas that before reshaper was conceived?14:41
jaypipesyes14:41
jaypipesbut now we're delaying the one thing that would actually be useful for fixing this problem for sharing providers. so, oh well, guess Stein it is.14:41
efriedWhat are you suggesting as an alternative? That we land reshaper and use it to fix sharing providers?14:42
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efriedin Rocky?14:42
jaypipesefried: yes.14:42
efriedBetween now (FF was last week) and The End?14:42
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jaypipesefried: I know FF was last week... I don't really care about FF if I'm being honest. Never have. Probably never will. I don't like rigid release cycles. sorry...14:43
jaypipesefried: I know I'm in the minority and am just bitching.14:43
efriedWell then, let's get the reshaper series finished up and reviewed, and we can buck the process when we've demonstrated that the code is ready, howzat?14:44
cdentjaypipes: I don't know that you're in the minority, I think it is rather that Dan and Matt and Mel have already stated their opinion and you weren't there14:44
cdent(not there for good reasons)14:44
jaypipesefried: heh, good luck with that :) but yes, I'm happy to review and fix up the reshaper series as needed. even though I know it doesn't have a chance of landing before October.14:45
cdent_plenty_ of people think the rigid release cycles are cray cray14:45
efriedCode is ready except for the last patch, which needs test. If we want to get aggressive about this, I can have that patch finished up in the next couple of days.14:45
jaypipescdent: it's not just dan, matt and melanie (and I don't blame them for anything). it's just the flow of OpenStack. it is what it is.14:45
* cdent blanches14:45
cdentI hate the phrase "it is what it is"14:45
jaypipesefried: I can commit to reviewing as much as is pushed up to gerrit.14:46
jaypipescdent: yeah, I know. sorry :(14:46
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efriedjaypipes: Series starts here: https://review.openstack.org/#/c/576927/ -- 8 patches, 7 of which are complete and ready for review.14:46
jaypipesefried: ack, I'll review all today.14:47
efriedCool, I'll work on that last patch.14:48
efriedwhich, of course, will be the most complicated :)14:48
efriedSo, anything else for today?14:48
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jaypipesnot from me.14:49
efriedight, laters y'all14:49
efried#endmeeting14:49
*** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings/"14:49
openstackMeeting ended Mon Jul 30 14:49:53 2018 UTC.  Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4)14:49
openstackMinutes:        http://eavesdrop.openstack.org/meetings/nova_scheduler/2018/nova_scheduler.2018-07-30-13.59.html14:49
openstackMinutes (text): http://eavesdrop.openstack.org/meetings/nova_scheduler/2018/nova_scheduler.2018-07-30-13.59.txt14:49
openstackLog:            http://eavesdrop.openstack.org/meetings/nova_scheduler/2018/nova_scheduler.2018-07-30-13.59.log.html14:49
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cdentthank efried14:50
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