Tuesday, 2016-09-06

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PaulMurray#startmeeting Nova Live Migration14:00
openstackMeeting started Tue Sep  6 14:00:04 2016 UTC and is due to finish in 60 minutes.  The chair is PaulMurray. 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 Live Migration)"14:00
openstackThe meeting name has been set to 'nova_live_migration'14:00
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PaulMurrayHello everyone14:00
davidgilukhi14:00
PaulMurrayAs usual: https://wiki.openstack.org/wiki/Meetings/NovaLiveMigration14:00
mdbootho/14:00
luis5tbo/14:01
pkoniszewskio/14:01
PaulMurrayHopefully everyone is back from summer now14:01
PaulMurrayI am14:01
mdboothApparently summer's about to restart. It had previously ended, though. Here's hoping.14:02
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PaulMurrayWe are past feature freeze now, so I thought we would skip feature stuff for now14:02
PaulMurray#topic CI14:02
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PaulMurrayI have been trying to catch up14:03
PaulMurrayI saw something about flaky NFS?14:03
PaulMurrayAny news14:03
PaulMurrayI guess that's a no14:04
PaulMurrayIf no-one has anything to say we'll go on14:04
PaulMurray#topic Bugs14:05
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pkoniszewskitdurakov is on vacations, so no update probably14:05
PaulMurraypkoniszewski, thanks14:05
mdboothjohnthetubaguy: https://bugs.launchpad.net/nova/+bug/160501614:05
openstackLaunchpad bug 1605016 in OpenStack Compute (nova) "Post copy live migration interrupts network connectivity" [High,Confirmed]14:05
mdboothI wondered if we could add a 'if post-copy: do_network_stuff()' at the end of pre_live_migration()14:06
PaulMurrayI don't know if johnthetubaguy is here, but I saw the comments14:06
pkoniszewskiwell, we can also go other way14:06
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pkoniszewskiwe do have a control on this switch14:06
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davidgilukluis5tb: did you have a chance to look at that postcopy network stuff?14:06
pkoniszewskii mean it's nova decision to switch pre-copy to post-copy14:07
raj_singhmdbooth: johnthetubaguy is on vacation till Wednesday14:07
mdboothraj_singh: Ok, thanks.14:07
PaulMurraypkoniszewski, but nova doesn't know when the switch has hapened14:07
pkoniszewskiit doesn't?14:07
PaulMurrayi don't think its synchronous is it?14:08
pkoniszewskidavidgiluk: ?14:08
pkoniszewskidavidgiluk: ^14:08
PaulMurrayI think nova triggers the switch14:08
davidgilukpkoniszewski: I only know it from the qemu side; luis5tb ^14:08
luis5tbdavidgiluk: no, not yet. I'm moving so I pretty busy the last weeks14:08
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mdboothThe thing is, if we're going to add a new callback it needs to be asynchronous, and concurrent with the migration.14:08
PaulMurraydanpb, said there is an event at the destination that we can pick up14:08
danpbyes, libvirt emits an event when post-copy starts14:08
PaulMurrayI noted it in the bug14:08
mdboothdanpb: Can we trigger nova code with context at the destination?14:08
danpbso you can use that to trigger the network change14:09
danpbon source it'll emit  PAUSED + reason POST_COPY14:09
mdboothSo libvirt can give us an async callback?14:09
danpbon target it'll emit RUNNING + reason POST_COPY14:09
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danpbnova  already  has an event handler registered with libvirt that'll be receiving these14:09
danpbso you merely need to wire up some code to trigger on it14:09
mdboothPaulMurray: I see your comment now. Read backwards and missed it.14:10
danpbshouldn't be any more complex that what nova already has todo to switch network when pre-copy finished14:10
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mdboothIs this considered a bug that's eligible for Newton?14:11
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mdboothmriedem: ^^^ ?14:11
mriedemhow much backscroll do i need to read here?14:11
danpbif it isn't considered eligible then you pretty much have to block any use of post-copy in Newton14:12
mdboothmriedem: About 5 lines.14:12
danpbas it is useless if network is fubar14:12
PaulMurrayI'm not sure its super critical14:12
PaulMurraybut it would be good if it can be done14:12
mriedemtalking about https://bugs.launchpad.net/nova/+bug/1605016 ?14:12
openstackLaunchpad bug 1605016 in OpenStack Compute (nova) "Post copy live migration interrupts network connectivity" [High,Confirmed]14:12
danpbPaulMurray: complete lack of working network while in post-copy phase seems pretty critical to me14:12
mdboothmriedem: Yes14:12
mriedembugs are fair game14:12
mdboothSo if this will be considered in Newton, I don't mind taking this.14:12
PaulMurraydanpb, yeah, but I meant we can do migration without it - so its not a show stopper14:13
mriedemis this like 100% fail with post-copy?14:13
mdboothmriedem: No, just no networking until it completes.14:13
davidgilukwhich is pretty bad14:13
mdboothWhich is a potentially long time, of course.14:13
danpbthat may be anywhere from a few milliseconds to many minutes14:13
pkoniszewskimdbooth: is that true for ANY neutron configuration?14:13
PaulMurraythat's why the problem is there - testing with vas that aren't really doing much means you don't notice14:14
PaulMurraybut with a busy vm it would be a problem14:14
mdboothpkoniszewski: I haven't looked at it in detail, yet, but I don't see how it could be otherwise?14:14
PaulMurraypkoniszewski, its not neutron that makes the difference14:14
PaulMurrayits the time it takes to complete the post-copy14:15
pkoniszewskic14:15
pkoniszewskisorry14:15
mdboothOk, sounds like we agree this is pretty bad and eligible for Newton.14:15
mdboothI'll have a stab at it.14:15
davidgilukmdbooth: Prod me if you need any help understanding postcopy14:16
mdboothdavidgiluk: Will do, thanks.14:16
danpbmdbooth: you should wear a stab proof vest, because live migration always stabs back :-P14:16
davidgilukhaha14:16
PaulMurraymdbooth, thanks - I'll see if we can help too14:16
PaulMurrayat least with testing14:16
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pkoniszewskiPaulMurray: just checked that nova-network does not require post copy steps to keep networking up14:16
mriedemi've tagged it with neutron-rc-potential14:16
luis5tbI'm happy to help too, but as this is high prio and I will not have too much time available within the nxt couple of weeks I prefer to not be the responsible one!14:17
pkoniszewskiand i'm pretty sure that it is only DVR case for neutron14:17
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PaulMurray#action mdbooth to fix https://bugs.launchpad.net/nova/+bug/160501614:17
openstackLaunchpad bug 1605016 in OpenStack Compute (nova) "Post copy live migration interrupts network connectivity" [High,Confirmed]14:17
PaulMurrayDo we have any other critical bugs ?14:18
pkoniszewskiyeah, i think14:18
pkoniszewskithis fixes regression that we introduced in newton14:18
pkoniszewskihttps://review.openstack.org/#/c/358599/14:18
PaulMurrayI saw that just now14:19
pkoniszewskibasically because of this bug everyone needs to set vnc/spice to listen all/localhost14:19
PaulMurrayis the patch close to done ?14:19
pkoniszewskii think that it can be merged in the current state14:20
mriedemi'll take a look at it after meetings14:20
markus_zThis fixes an older issue with live migration + serial console ports: https://review.openstack.org/#/c/275801/14:20
markus_zI wasn't sure if you're aware of that one.14:21
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pkoniszewskianother one is that it is impossible to use dedicated interfaces for live migration using our default confiugration - https://review.openstack.org/#/c/356558/14:21
pkoniszewskibasically it has never worked14:21
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PaulMurrayThere are related changes - this one has +2 https://review.openstack.org/#/c/335132/714:22
danpbpkoniszewski: not entirely true - it worked fine if using VIR_MIGRATE_TUNNELLED14:22
danpbpkoniszewski: which used to be our default until recently14:22
danpbbut i agree we should fix it14:22
pkoniszewskii wasn't fast enough to add that it works while tunnelling is on, which is not out default configuration anymore14:23
pkoniszewskithanks danpb14:23
danpbIOW, this is a regression from previous state, so we should fix it14:23
PaulMurrayhttps://bugs.launchpad.net/nova/+bug/145525214:24
openstackLaunchpad bug 1455252 in OpenStack Compute (nova) "enabling serial console breaks live migration" [High,In progress] - Assigned to sahid (sahid-ferdjaoui)14:24
mriedemplug for long-standing live migration + dvr change that neutron wants in for newton: https://review.openstack.org/#/c/275073/ - i have a todo to get back to reviewing that again14:24
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PaulMurraymriedem, yes, that's on the agenda14:24
PaulMurrayjust noting these console bugs14:24
PaulMurrayhttps://bugs.launchpad.net/nova/+bug/159596214:25
openstackLaunchpad bug 1595962 in OpenStack Compute (nova) "live migration with disabled vnc/spice not possible" [Medium,In progress] - Assigned to Markus Zoeller (markus_z) (mzoeller)14:25
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mriedemPaulMurray: if we have regressions in newton then we should tag those bugs with newton-rc-potential14:25
mriedemat least to get them attention in the next 2 weeks14:25
PaulMurrayok - will do14:25
mriedemRC1 is in 2 weeks14:25
PaulMurraymriedem, the neutron one still have a failing tempest test14:26
PaulMurrayis anyone looking at that ?14:26
PaulMurrayhttps://review.openstack.org/#/c/286855/14:26
PaulMurraythat's the test14:27
PaulMurraythe fix is:14:27
PaulMurrayhttps://review.openstack.org/#/c/27507314:27
mriedemPaulMurray: just to be clear, that's a WIP test14:27
mriedemi mean, it's throw away, just to test that nova dvr change14:27
mriedemgate-tempest-dsvm-neutron-dvr-multinode-full is the job in that tempest change we care about14:28
mriedemwhich is passing14:28
PaulMurrayah, goo news14:28
PaulMurraySo we just need review on that fix then14:28
mriedemwell i'm rechecking the tempest fix14:28
mriedemto run that job again, it hasn't run on the latest nova PS14:28
mriedembut yeah14:29
mriedemi reviewed the nova change a couple of weeks ago, some perf improvements and lots of missing unit tests, but otherwise it looks pretty close14:29
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PaulMurray#action ALL look at https://review.openstack.org/#/c/27507314:30
PaulMurrayAny others to mention14:30
mriedemnot a bug, but,14:31
mriedemi haven't yet gone through the libvirt imagebackend refactor series yet to start -2ing14:31
mriedembut expect that early this week14:31
mriedemi think that's the last bp i have left to sort out for what's in FF and what's not14:31
PaulMurrayThe list is here https://bugs.launchpad.net/nova/+bugs?field.tag=live-migration+14:32
mdboothmriedem: Thanks :)14:32
PaulMurrayThere are a number of 'high' importance bugs in progress14:32
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PaulMurraymarkus_z, have you been checking if bugs actually are in progress ?14:32
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PaulMurrayThere are about 7 or 8 and we have discussed some already14:34
PaulMurrayso lets have a quick look at the others14:34
PaulMurrayhttps://bugs.launchpad.net/nova/+bug/141957714:35
openstackLaunchpad bug 1419577 in OpenStack Compute (nova) "when live-migrate failed, lun-id couldn't be rollback in havana" [High,In progress] - Assigned to Lee Yarwood (lyarwood)14:35
PaulMurrayanyone know about this? it has a fix here https://review.openstack.org/#/c/338929/14:36
PaulMurrayits by lee yarwood14:36
PaulMurrayThe next two we know about14:37
mdboothLee is off for a bit14:37
mdboothNot sure when he's back14:37
PaulMurraythe fourth is the volume breaks CI one14:37
PaulMurrayok mdbooth14:38
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PaulMurrayThis one looks quite specific14:38
PaulMurrayhttps://bugs.launchpad.net/nova/+bug/156662214:38
openstackLaunchpad bug 1566622 in OpenStack Compute (nova) "live migration fails with xenapi virt driver and SRs with old-style naming convention" [High,In progress] - Assigned to Corey Wright (coreywright)14:38
PaulMurraythe fix that was up for review has been abandoned in july14:39
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PaulMurrayhttps://bugs.launchpad.net/nova/+bug/160025114:39
openstackLaunchpad bug 1600251 in OpenStack Compute (nova) "live migration does not honor server group policy" [High,In progress] - Assigned to Paul Carlton (paul-carlton2)14:39
PaulMurraythis has a fix up that should be easy to finish off14:40
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PaulMurrayhttps://review.openstack.org/#/c/339588/14:40
paul-carlton2I lokked at that this morning will fix it when done with current task14:40
PaulMurraythanks paul-carlton214:40
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PaulMurraythe next one we discussed already14:41
PaulMurraythen we have14:41
PaulMurrayhttps://bugs.launchpad.net/nova/+bug/160799614:41
openstackLaunchpad bug 1607996 in OpenStack Compute (nova) "Live migration does not update numa hugepages info in xml" [High,In progress]14:41
PaulMurrayunassigned14:42
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PaulMurraydanpb, do you know anything about this ? I know you haven't commented on the bug14:43
* mdbooth wonders why sfinucan unassigned himself14:43
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danpbPaulMurray: its not entirely suprising - i mean the original numa/hugepage code never tried to make migraiton work14:44
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* danpb doesn't even know if we update NUMA topology upon migration yet, let alone hugepages14:44
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PaulMurraydanpb, I think that's all work in progress at the moment - along with claims on destination etc14:45
danpbyeah14:45
danpbthere's probably another open bug somewhere you can mark it a duplicate of14:45
PaulMurrayI'll take a look14:46
mdboothdanpb: Is numa topology allowed to change during live migration?14:46
PaulMurrayThat's all the high importance bugs.14:46
danpbmdbooth: guest NUMA topology cannot change but the host<->guest placement can14:47
mdboothGot it.14:47
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danpbits just that nova has never tried to14:47
PaulMurraythe only ones not in progress are the post-copy network problem and the volume based live migration one that's messing up CI14:47
danpbbecause it has complex interactions in the schedular that need fixing first14:47
PaulMurraymost have reviews up, so lets try to get those in at least.14:48
PaulMurrayI'll make a list and put it on the ML and our tracking page14:48
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PaulMurrayFeel free to add if something needs attention that is not there14:49
PaulMurray#topic Open discussion14:49
*** openstack changes topic to "Open discussion (Meeting topic: Nova Live Migration)"14:49
PaulMurrayanything left over to discuss ?14:49
PaulMurrayI think we're done14:50
PaulMurrayThanks for coming14:50
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PaulMurray#endmeeting14:50
*** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings"14:50
openstackMeeting ended Tue Sep  6 14:50:53 2016 UTC.  Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4)14:50
openstackMinutes:        http://eavesdrop.openstack.org/meetings/nova_live_migration/2016/nova_live_migration.2016-09-06-14.00.html14:50
openstackMinutes (text): http://eavesdrop.openstack.org/meetings/nova_live_migration/2016/nova_live_migration.2016-09-06-14.00.txt14:50
openstackLog:            http://eavesdrop.openstack.org/meetings/nova_live_migration/2016/nova_live_migration.2016-09-06-14.00.log.html14:50
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