Wednesday, 2020-10-21

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timburke#startmeeting swift21:00
openstackMeeting started Wed Oct 21 21:00:25 2020 UTC and is due to finish in 60 minutes.  The chair is timburke. Information about MeetBot at http://wiki.debian.org/MeetBot.21:00
openstackUseful Commands: #action #agreed #help #info #idea #link #topic #startvote.21:00
*** openstack changes topic to " (Meeting topic: swift)"21:00
openstackThe meeting name has been set to 'swift'21:00
timburkewho's here for the swift meeting?21:00
acoleso/21:00
kota_hi21:00
seongsoochoo/21:00
clayg🥳21:00
rledisezhi o/21:01
timburkefirst order of business21:01
timburke#topic acoles is back!21:02
*** openstack changes topic to "acoles is back! (Meeting topic: swift)"21:02
timburke🎉21:02
acoleshi everyone, it's nice to be here again21:02
kota_amazing21:02
timburkeif there are no objections, i'd like to give him commit rights again21:03
rlediseztimburke: +221:03
claygi didn't realize we'd retired him21:04
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timburkeexcellent -- 'cause i jumped the gun a little and already did it :-)21:05
timburkei figure, we can use all the help we can get -- thanks for coming back acoles, and so glad to have you back!21:06
timburke#topic ptg21:06
*** openstack changes topic to "ptg (Meeting topic: swift)"21:06
timburkeand he has good timing, as we've got the PTG next week!21:06
kota_yey21:06
timburketopics continue to gathre on the etherpad21:07
timburke#link https://etherpad.opendev.org/p/swift-ptg-wallaby21:07
seongsoocho\o/21:07
timburke...and i should be sure to set aside sometime for some ops feedback and community feedback21:07
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claygexcellent21:09
timburkei don't really have much of a plan for next week, but as long as we're all together, thinking and chatting about swift, i know good things will come outof it :-)21:09
timburkei'll try to order items by level of interest again, probably on friday -- so put yourself down for topics that you care about! it'll give us a good way to prioritize conversations21:10
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timburkeand since we'll have the PTG together, i figure no irc meeting is necessary next week21:11
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acolestimburke: how does it work - is all discussion over irc?21:11
mattoliveraunah all zoom or whatever21:12
timburkevideo chats over zoom21:12
acolesah ok21:12
claygit was not too bad!  not as good as whiteboard 😞21:12
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timburkethough we can also use jitsi via https://meetpad.opendev.org/swift-ptg-wallaby21:13
mattoliverauWe probably still need to figure out how to white board things21:13
seongsoochoclayg:   maybe you can use jamboard as a white board https://jamboard.google.com/21:13
claygworth a shot!!!  💪21:14
timburkefingers crossed that in another six months, things have quieted down enough that we can actually all be in the same physical room again21:14
mattoliverauNice21:14
claygtimburke: that would be GREAT - miss everyone 😢21:14
timburkei've got just one more "announcement"-type item21:15
timburke#topic review.openstack.org security incident21:15
*** openstack changes topic to "review.openstack.org security incident (Meeting topic: swift)"21:15
timburkeyou all may have noticed that gerrit was down yesterday21:15
* acoles not my fault21:15
timburkethere's a nice write-up of what happened at21:16
timburke#link http://lists.opendev.org/pipermail/service-announce/2020-October/000011.html21:16
mattoliverauLol, acoles comes back and then.. hmm21:16
kota_lol21:16
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claygit wasn't so bad - just a bummer day21:17
timburkei want to applaud the infra team's transparency and quick response; considering the scope of what needed to be checked, losing a day seems remarkably fast21:17
mattoliverau+10021:17
timburkeone of the action items was that "We should audit all changes for projects since 2020-10-01."21:18
timburkethey already compiled the commits for us at21:18
timburke#link https://static.opendev.org/project/opendev.org/gerrit-diffs/21:18
timburkeand i've already confirmed swift, python-swiftclient, and liberasurecode commits look correct and expected21:19
mattoliverauNice work, thanks timburke21:19
timburke(pyeclib and swift-bench didn't even have enough activity to show up)21:20
timburkeare there other projects that i'm forgetting about that i should check?21:20
timburkeif anyone has other projects that they have a vested interest in, that's where you can go for first-hand data; expect most temas to put out statements on the mailing list as well (i certainly intend to, probably shortly after this meeting)21:22
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timburkeall right, on to updates!21:23
timburke#topic updates21:24
*** openstack changes topic to "updates (Meeting topic: swift)"21:24
timburkewe've got two patches that i think mostly just need reviews21:24
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timburke#link https://review.opendev.org/#/c/706653/21:24
patchbotpatch 706653 - swift - Let developers/operators add watchers to object au... - 37 patch sets21:24
timburke#link https://review.opendev.org/#/c/754242/21:24
patchbotpatch 754242 - swift - Fix a race condition in case of cross-replication - 6 patch sets21:24
timburkei'd meant to look at both and wound up looking at neither :-(21:24
timburkedoes anyone have anything else they'd like to discuss about them? or is it mostly a matter of us finding time to review them?21:25
timburkei know zaitcev put a +2 on the replication patch -- thanks!21:26
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zaitcevI'm worried that I missed some kind of deadlock there, but I cannot find any. I looked at all instances where lock_path is invoked for various paths.21:26
zaitcevSo, what the heck, seems okay. +221:27
zaitcevI owed Romain for looking at Dark Data21:27
acolesdid patch 706653 have a predecessor - it rings a bell, and I see torgomatic is an author21:27
patchbothttps://review.opendev.org/#/c/706653/ - swift - Let developers/operators add watchers to object au... - 37 patch sets21:27
zaitcevYes.21:27
zaitcevpatch 21282421:28
patchbothttps://review.opendev.org/#/c/212824/ - swift - Let developers/operators add watchers to object audit - 21 patch sets21:28
zaitcevSee, this is "alternative"21:28
zaitcevacoles: I worked on Sam21:28
acoles@zaitcev thanks21:29
zaitcev's patch first, but ended with a trouble trying to debug things, so I threw my toys down and forked it.21:29
timburkethe main change (zaitcev, correct me if i'm wrong) was that sam's patch had a much more adversarial attitude towards the watchers, and so enforced process isolation21:30
zaitcevI created a logger for Sam's patch that actually worked, before the fork.21:30
timburkewhere this patch runs it all in the same process -- and if a watcher breaks the audit, you need to fix itor drop it21:30
zaitcevTo an extent, we still isolate, as much as Python allows. But a plugin can run out of file descriptors, for example.21:31
acolesok, so IIRC Sam's used a queue so watchers got notifications on 'best-effort' basis. Is this more guaranteed to notify watchers?21:32
zaitcevThis is just a method call, no queue.21:33
timburke...or call os._exit(0), or os.kill(os.getpid(), signal.SIGKILL), or time.sleep(1<<30)...21:35
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zaitcevSo, anyway.21:37
zaitcevIf Alistair finds a moment to look, it would be good. But for the extra lock for replicators too.21:38
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timburkesounds like we mainly need to get some reviews on them. i'll get the replicator guy squared away -- i've probably been overthinking my dev setup, and promise to leave *some* sort of review by the end of the week21:39
acolesI'll try but can't promise21:40
timburkezaitcev, do you know if david is planning to be at the ptg? i remember seeing audit watchers on the agenda21:40
claygnoice21:40
timburkedo we think that'll mostly be a session to discuss and land it?21:40
zaitcevtimburke: he was interested in it, but I don't know if he can do it.21:41
timburkeno worries; just figured i'd check21:42
timburkeall right21:42
timburke#topic open discussion21:42
*** openstack changes topic to "open discussion (Meeting topic: swift)"21:42
timburkewhat else should we bring up this week?21:42
acolesis there any kind of sign up for ptg or just show up?21:43
timburkeacoles, https://october2020ptg.eventbrite.com/21:43
acolesthanks21:43
timburkethough i'm sure you could also just show up and we'd make itwork ;-)21:43
acolesi want my t shirt21:43
kota_lol21:44
timburke...who wants to tell him?21:44
zaitcevlol21:44
acolesawww21:44
timburke🤔 i *should* talk to notmyname, investigate doing a small run of shirts...21:45
clayg😬 cutting it close now21:45
timburkealso, i wonderif we've still got some swiftstack shirts stashed somewhere -- collector's items, now!21:45
mattoliverauYeah, even if it's in red bubble or something so we pay for our own shirts, just need the design.21:45
clayghahah21:45
timburkeclayg, oh, almost certainly for a future event21:45
claygoic21:46
kota_zoom list windows showing guys who wear same shirts should look great on the virtual event, so +121:47
acolesi think I have a pile of those hpe iron on badges somewhere...21:47
zaitcevI have my yellow-orange "Swift Justice" shirt.21:48
kota_Justice!21:48
timburkei wore mine for acoles's first day back21:48
timburkeoh! one other patch i'd like to call attention to -- https://review.opendev.org/#/c/758636/21:49
patchbotpatch 758636 - swift - Add option to REPLICATE to just invalidate hashes - 2 patch sets21:49
timburkei've got this memory of talking about doing something like that as a *pre*-sync check, to try to feel out when there might be a newly-assigned primary21:50
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zaitcevCurious. Does that help performance any, or what does it do?21:53
timburkestill needs tests (and some fixups, looks like), but i wanted to have people start thinking about how we could make replication smarter if we had a cheap way to check remote suffix counts21:53
timburkeso the idea specific to that patch is that when you're moving data as part of a rebalance (and so, suffixes are probably fairly dense, say 3k or so), the sender doesn't really need to wait for the rehash to clean up data; it just needs to make sure everybody got invalidated21:55
timburkebut *in the future* i've got this thought like we could get rid of handoffs-first and instead have partition sync jobs in a priority queue of sorts, weighted by some combination of how many suffixes are in the partition (if it's a handoff) and when it was last successfully synced21:57
claygtimburke: nice!21:59
claygskipping the re-hash IO on the post-rsync invalidate step seems like a quite reasonable enhancement to me21:59
timburkeall right, we're about at time. oughta let kota_ and mattoliverau start their day, and acoles end his :-)22:00
timburkethank you all for coming, and thank you for working on swift!22:01
mattoliverauKk, so great to have you back acoles22:01
timburkeacoles, again, greatto have you back!22:01
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timburke#endmeeting22:01
*** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings/"22:01
openstackMeeting ended Wed Oct 21 22:01:22 2020 UTC.  Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4)22:01
openstackMinutes:        http://eavesdrop.openstack.org/meetings/swift/2020/swift.2020-10-21-21.00.html22:01
openstackMinutes (text): http://eavesdrop.openstack.org/meetings/swift/2020/swift.2020-10-21-21.00.txt22:01
openstackLog:            http://eavesdrop.openstack.org/meetings/swift/2020/swift.2020-10-21-21.00.log.html22:01
clayg☕ & 🍷22:01
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