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kota_ | good morning | 00:14 |
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openstackgerrit | Spencer Krum proposed openstack/swift: Hi zuul, it's me, nibz https://review.openstack.org/355676 | 00:21 |
mattoliverau | kota_: morning | 00:23 |
kota_ | mattoliverau: morning | 00:24 |
redbo | /win 3 | 00:29 |
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openstackgerrit | Kota Tsuyuzaki proposed openstack/swift: Follow up delayed reap probe test https://review.openstack.org/355683 | 01:08 |
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openstackgerrit | Kota Tsuyuzaki proposed openstack/swift: Don't run probe tests if resetswift failed https://review.openstack.org/355687 | 01:32 |
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openstackgerrit | Tim Burke proposed openstack/swift: Autovivify X-Versions-Location container https://review.openstack.org/265015 | 02:10 |
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mahatic_ | good morning | 02:34 |
mattoliverau | mahatic_: morning! | 02:36 |
openstackgerrit | Merged openstack/swift: Added a test for delayed reap. https://review.openstack.org/321041 | 02:36 |
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timburke | kota_: fyi, i think i'll have a new patchset for you before long | 03:28 |
kota_ | timburke: okay, thanks for your info! | 03:31 |
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openstackgerrit | Tim Burke proposed openstack/swift: Add "history" mode to versioned_writes middleware https://review.openstack.org/214922 | 04:08 |
kota_ | timburke: so quick! | 04:08 |
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timburke | kota_: i'd been think about what needed to change and already had a lot of it done before i pinged you :) | 04:10 |
kota_ | timburke: hehe, nice. i'm feeling it takes a day-ish when saying "before long" on my poor English | 04:11 |
timburke | i think timezones may also play into it :-) speaking of, i should go home | 04:13 |
notmyname | what?! | 04:13 |
timburke | but i really like where things are going with defaulter + history mode + auto-vivifying version locations :-) | 04:13 |
notmyname | timburke: go home! why are you in the office? | 04:13 |
timburke | notmyname: ...whiskey? | 04:13 |
timburke | i mean, uh... | 04:13 |
notmyname | ah, yes. sales team meetings | 04:13 |
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kota_ | timburke: i agree with notmyname you should go home, I am going to run tests instead of you in JST | 04:15 |
notmyname | wheee. time to send another email | 04:18 |
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timburke | hrm. judging by http://lists.openstack.org/pipermail/openstack-dev/2016-August/101411.html i didn't do what i thought i did in https://github.com/openstack/python-swiftclient/commit/aa0edd0 | 04:30 |
timburke | ...or requests wasn't behaving as i thought it did? | 04:31 |
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openstackgerrit | Charles Hsu proposed openstack/swift: Ignore auditor status files to prevent replicator reports errors https://review.openstack.org/353648 | 07:52 |
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openstackgerrit | Davanum Srinivas (dims) proposed openstack/swift: [WIP] Testing latest u-c https://review.openstack.org/318441 | 08:10 |
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kota_ | hi, acoles. thanks for commenting on delay reap probe tests. | 08:52 |
kota_ | acoles: i did wrong but i found another issue that why i did so. | 08:52 |
acoles | kota_: hi kota_ NP sounds like not failing when resetswift fails cost you a lot of time :/ | 08:53 |
kota_ | yes, that's what i'd like to resolve at patch 355687 | 08:54 |
patchbot | kota_: https://review.openstack.org/#/c/355687/ - swift - Don't run probe tests if resetswift failed | 08:54 |
acoles | kota_: yep | 08:54 |
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acoles | kota_: I see same thing with sudo .probetests | 08:58 |
openstackgerrit | OpenStack Proposal Bot proposed openstack/swift: Updated from global requirements https://review.openstack.org/88736 | 09:01 |
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* kota_ is going to dinner table. | 09:13 | |
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openstackgerrit | zheng yin proposed openstack/swift: simplify code https://review.openstack.org/355858 | 11:27 |
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openstackgerrit | Alistair Coles proposed openstack/swift: EC - eliminate .durable files https://review.openstack.org/355958 | 14:17 |
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openstackgerrit | Alistair Coles proposed openstack/swift: Improve doc for using container-sync with large objects https://review.openstack.org/356012 | 15:36 |
notmyname | good morning | 15:36 |
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acoles | notmyname: good morning. is it ok for us to manually mark bugs with fix committed/released? I often see email from an openstack bot doing that but in this case the patch did not reference the bug so there is no record | 15:52 |
acoles | i.e. https://bugs.launchpad.net/swift/+bug/1487791 | 15:52 |
openstack | Launchpad bug 1487791 in OpenStack Object Storage (swift) "POST to DLO squashes data without fast-POST" [Undecided,In progress] - Assigned to Janie Richling (jrichli) | 15:52 |
notmyname | acoles: yep. IIRC it should be set to "fix released" | 15:55 |
notmyname | that is, I don't think the bot goes along at release time to move stuff from committed to released | 15:56 |
notmyname | and I think the bot these days just puts stuff into "Released" | 15:56 |
openstackgerrit | Donagh McCabe proposed openstack/swift: Corrections for the API specifications in api-ref https://review.openstack.org/354767 | 16:01 |
acoles | notmyname: k. thanks | 16:06 |
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openstackgerrit | Alistair Coles proposed openstack/swift: Add test for HeaderKeyDict https://review.openstack.org/353940 | 16:54 |
timburke | good morning | 17:06 |
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manoelrui | hello guys | 17:24 |
manoelrui | I have noted a high latency after rebalancing ring operation. The system keeps high latency even after rebalancing operation is completed. | 17:25 |
manoelrui | The swift environment was deployed with 1 proxy node and 6 storage nodes. | 17:25 |
manoelrui | Do you know what is happening? | 17:25 |
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clayg | patch 198633 looks cool! nice work kota_ acoles_ and tdasilva | 18:57 |
patchbot | clayg: https://review.openstack.org/#/c/198633/ - swift - Last-Modified header support on HEAD/GET container (MERGED) | 18:57 |
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timburke | oh, sweet! i hadn't noticed that it merged; I kept meaning to take a look at it. I suppose there's still time to review https://review.openstack.org/#/c/198634 though! | 18:59 |
patchbot | timburke: patch 198634 - swift - Support last modified on listing containers | 19:00 |
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lcurtis | hello all...seeing certain devices continue to fill up even after rebalancing...is it a bad thing to have full disks in Swift? | 19:20 |
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clayg | lcurtis: yeah most storage systems get sorta bummed about running out of capacity - swift's no magic there - although a few things have got in that made it less bad over the years | 19:30 |
clayg | lcurtis: you running replicated storage policy? Probably need to start tuning your replicators. | 19:30 |
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lcurtis | @clayg yes..running replicated | 19:35 |
lcurtis | thank you | 19:35 |
lcurtis | i think we ran for a period where our ingest was faster than replication | 19:35 |
lcurtis | and also we had too many rsyncs running which killed performance | 19:36 |
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clayg | ok, this is write-affinity cluster? | 19:40 |
clayg | I'd recommend you migrate to rsync module per disk for better max_connections tuning to limit the effects of tarpit disks - then give http://docs.openstack.org/developer/swift/admin_guide.html?highlight=full#preventing-disk-full-scenarios a read | 19:42 |
clayg | most of the time you can turn the replicators concurrency tunable up, more-so if you have dedicated replication object-server's | 19:43 |
lcurtis | yes...we did turn it up | 19:43 |
lcurtis | it was set to zero back from when we first set up cluster | 19:43 |
lcurtis | doh | 19:43 |
clayg | this is also a great strategy for monitoring overall rebalance progress -> http://docs.openstack.org/developer/swift/admin_guide.html?highlight=full#checking-handoff-partition-distribution | 19:44 |
clayg | lcurtis: well that's good! | 19:44 |
lcurtis | :) | 19:44 |
lcurtis | many thanks clayg | 19:45 |
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notmyname | FYI the tc meeting is in 5 minutes in #openstack-meeting. among other things, they're talking about the tc-goals resolution and accepting storlets as an openstack project | 19:55 |
notmyname | I'll be there, at least lurking. not sure how much I'll need to speak up | 19:56 |
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manoel_rui | clayg notmyname hi, can you help me ? | 20:17 |
notmyname | manoel_rui: I'm in a meeting right now | 20:17 |
manoel_rui | notmyname no problem, thanks | 20:18 |
clayg | manoel_rui: what's up? | 20:18 |
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manoel_rui | clayg I have noted a high latency after rebalancing ring operation. The system keeps high latency even after rebalancing operation is completed. | 20:20 |
manoel_rui | clayg The swift environment was deployed with 1 proxy node and 6 storage nodes. | 20:20 |
manoel_rui | clayg do you know what is happening or any idea ? | 20:21 |
clayg | how are you measuring "rebalancing operation is complete" - how are you measuring latency for that matter? | 20:22 |
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clayg | it is not uncommon that large capacity adjustments - a rebalance - will add load to the cluster - which can impact overall quality of service - it's a trade off how fast you want the cluster topology to move vs how much you want to smooth out the service quality for clients - it's not always cut and dry | 20:23 |
clayg | do you monior system stats - particularlly disk load? is this triple replicated rsync policy? seperate a/c tier? | 20:24 |
notmyname | info: the tc-goals proposal has been approved as-is, with a comment in the meeting that wording changes can be considered separately as follow-on patches | 20:25 |
ahale | do you think projects that fail to adequately document why they didnt achieve one of the targets will all be treated the same? even ones that have had the tc members write rants about not playing nicely with others | 20:26 |
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manoel_rui | clayg I am using statsd, monitoring some metrics like "object-replicator.suffix.syncs.count" | 20:27 |
manoel_rui | clayg I am using cosbench for measuring latency | 20:28 |
clayg | I think that suffix syncing should continue even after a rebalance completes = you should consider monitoring parition placement with something like dispersion-(populate|report) or http://docs.openstack.org/developer/swift/admin_guide.html#checking-handoff-partition-distribution | 20:29 |
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clayg | is the cluster fairly new then? there's a few implications of file system layout that don't really show up until you get enough objects in the cluster - the performance of a empty disk may not be the same as a cluster that's been running for years all other things being the same | 20:31 |
manoel_rui | clayg what metric do you refer about disk load ? I am using 3 replicas for object and 2 replicas per a/c. All replicas are in same 6 storage nodes | 20:32 |
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clayg | how many devices per node? all storage tiers on all devices? | 20:35 |
clayg | for disk load interactively I use iostat mostly I guess? but I have all alot of that stuff plumbed to graphite dashboards via collectd | 20:36 |
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manoel_rui | clayg The cluster is an experimental environment that I can delete all objects, so is a new cluster | 20:37 |
manoel_rui | clayg one device per node and all tiers are spread to all devices | 20:39 |
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clayg | manoel_rui: it's not clear to me how this is related to rebalance then - you ran a cosbench and saw one latency - you ran it again and saw a different number? But there's lots of things that could cause that - how do you want to narrow it down? | 20:39 |
clayg | i hate to ask... but are these vms? | 20:40 |
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notmyname | ahale: you may understand why I've been picky about the proposed wording ;-) | 20:43 |
manoel_rui | clayg Basicly, I'm running the workload with a constant number of clients along the time without any performance loss. | 20:43 |
ahale | :) | 20:43 |
manoel_rui | clayg when I update the ring while system is running I can observe that performance gets down | 20:44 |
manoel_rui | clayg so, after I wait for a long time the performance keeps worse. | 20:45 |
clayg | ok, then - that's inline with my experience as well - rebalance moves data - moving data produces load - load from consistency engine can put backpressure on client facing quality of service - there's lots of tradeoffs available | 20:45 |
clayg | how do you measure "a long time" - like wait two weeks? a day? I think you should observe your replicators and partition movement closely after introducing a ring change | 20:46 |
manoel_rui | clayg I was hopping the performance would came back one moment. | 20:46 |
manoel_rui | clayg and yes, I'm using VMs | 20:47 |
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clayg | a coworker of mine likes to remind us "RINGS ARE NOT MAGIC PIXY DUST THAT TRANSPORT DATA!!!" - I think his point is just that rebalancing clusers requires bytes to be read from disk, transfered over a wire and written onto a another disk - these operations take significantly longer than it does to rework the ring data structure - you should investigate this more closely and see if it matches your expectations/understanding/obs | 20:49 |
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ahale | i spent about 6 or 7 hours today poking replication in a cluster and was happy a moved a 'where data is and where it should be' guage by about 0.1% | 20:52 |
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manoel_rui | claygs I'm using a small workload, so need just few hours | 20:59 |
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clayg | manoel_rui: that's possible, maybe double check your logs, if replication is finishing and all partitions have correctly rebalanced then it's not clear to me why performance would be appreciably worse than before the rebalance - unless the total avaiable cluster resources have been reduced? | 21:06 |
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openstackgerrit | Tim Burke proposed openstack/swift: Drop X-Auth-Token from all versioned_writes subrequests https://review.openstack.org/307929 | 21:11 |
manoel_rui | clayg I see, I will try explore closely this issues, may be I'm not seeing what resource is overloaded, thank you for you help | 21:12 |
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mattoliverau | Morning | 22:16 |
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zaitcev | Everyone working on Swift becomes a master of stuffing API extensions into unexpected nooks and cracks. | 23:51 |
zaitcev | Eventually. | 23:51 |
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