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| openstackgerrit | Merged openstack/higgins: Updated from global requirements https://review.openstack.org/343838 | 02:25 |
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| hongbin | All, team meeting starts now in #openstack-meeting channel | 03:00 |
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| hongbin | Qiming: flwang1 flwang ^^ | 03:01 |
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| vinayp | Hi Hongbin !! | 03:04 |
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| hongbin | vinayp: sorry, running the team meeting | 03:06 |
| xiangxinyong | hello | 03:09 |
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| mkrai | hongbin, I think its too late for you now | 04:00 |
| hongbin | Yes, 12am :) | 04:01 |
| mkrai | I will ping you tomorrow morning | 04:01 |
| hongbin | kk | 04:01 |
| mkrai | Have a good night! | 04:01 |
| mkrai | Bye | 04:01 |
| yanyanhu | bye | 04:01 |
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| mkrai | yanyanhu, What's time for you now? | 04:01 |
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| Qiming | about introducing etcd, I'm still curious about the problems we want to solve | 04:05 |
| yanyanhu | mkrai, it's morning, 12:00 AM :) | 04:05 |
| Qiming | if the problem is about a reliable, distributed storage of resource states, it sounds more like an alternative to sqlalchemy, not a replacement of rabbitmq | 04:06 |
| mkrai | Yes Qiming I also have that confusion | 04:06 |
| mkrai | Rabbitmq and etcd are both independent | 04:06 |
| mkrai | We need etcd to store containers state | 04:06 |
| mkrai | We have faced issues in Magnum where we tried to store container state in db | 04:07 |
| Qiming | then it sounds more like a storage backend, instead of a messaging backend | 04:07 |
| mkrai | No single point of truth | 04:07 |
| yanyanhu | mkrai, my understanding is etcd is another way to perform inter-module communication | 04:07 |
| yanyanhu | messaging is the way we are common used in openstack services | 04:08 |
| yanyanhu | not sure whether this understanding is correct | 04:08 |
| yanyanhu | s/used/using | 04:08 |
| mkrai | yanyanhu, I am not sure if that's a valid usecase of etcd | 04:08 |
| yanyanhu | yes, since the case could be different | 04:09 |
| Qiming | without diving into the details, here is their positioning: https://github.com/coreos/etcd/blob/master/README.md | 04:09 |
| Qiming | it reads "etcd is a distributed, consistent key-value store for shared configuration and service discovery" | 04:09 |
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| mkrai | Yes it is more for key-value store | 04:11 |
| yanyanhu | so maybe we use rabbitq for inter-module communication while etcd/tooz for state management | 04:11 |
| yanyanhu | there is no conflict here | 04:11 |
| mkrai | yes | 04:11 |
| mkrai | But as hongbin said there is overhead in using rabbitmq | 04:11 |
| yanyanhu | we just replace sql db with kv storage | 04:12 |
| mkrai | when no of services in Zun increases | 04:12 |
| Qiming | it has some peer communication channel, e.g. 2380, but that channel seemed to me mainly a mechanism for state synchronization | 04:12 |
| mkrai | Yes that part is clear | 04:12 |
| Qiming | yes, yanyanhu, that is my understanding | 04:12 |
| mkrai | Yes mine too | 04:12 |
| Qiming | cool | 04:12 |
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| yanyanhu | will post my investigation on Tooz. I guess we can have further discussion in next meeting and make a conclusion :) | 04:13 |
| mkrai | yanyanhu, Tooz is for message passing? | 04:13 |
| yanyanhu | mkrai, no, it's for data storage and lock management | 04:13 |
| yanyanhu | and also group membership | 04:14 |
| mkrai | Ok so it can be a replacement for etcd | 04:14 |
| yanyanhu | it is kinda broker which used to bridge different backend, like etcd, zookeeper and also sql dbs | 04:14 |
| mkrai | for message passing we don't have any alternative now | 04:14 |
| yanyanhu | mkrai, it wraps etcd I think | 04:14 |
| yanyanhu | provide unified lib for different kinds of backend | 04:15 |
| yanyanhu | http://docs.openstack.org/developer/tooz/ | 04:15 |
| Qiming | rabbitmq is not perfect, but among the many AMQP implementations, it is the best we have today, according to some evaluation reports | 04:15 |
| yanyanhu | here is the introduction | 04:15 |
| mkrai | Ok is it used in any other project? | 04:15 |
| mkrai | Qiming, I had discussion with hongbin yesterday about rabbitmq | 04:16 |
| Qiming | tooz is used in ceilometer? | 04:16 |
| yanyanhu | mkrai, I recall there is a consensus that Tooz will be the choice to address DLM issue in openstrack | 04:16 |
| mkrai | And he said one solution is to remove conductor service | 04:16 |
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| yanyanhu | Qiming, I remember two projects have used it | 04:16 |
| mkrai | That reduces the communication | 04:16 |
| yanyanhu | but can't recall the name | 04:16 |
| yanyanhu | mkrai, but we still need message/rpc calls between different modules | 04:17 |
| mkrai | Ok np you can post your investigation | 04:17 |
| yanyanhu | mkrai, yes, then we can have a better understanding of it :) | 04:17 |
| mkrai | Yes but that removes atleast one communication path | 04:17 |
| yanyanhu | mkrai, yes | 04:17 |
| mkrai | api-> conductoe -> compute is not good as api -> compute | 04:18 |
| mkrai | conductor does nothing for us so it is ok to remove it | 04:18 |
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| yanyanhu | yes, agree | 04:19 |
| mkrai | Qiming, so you link for evaluation report link for AMQP implementations? | 04:19 |
| mkrai | s/so/do you have/ | 04:19 |
| Qiming | mkrai, cannot find it at hand | 04:20 |
| mkrai | Ok please post it on etherpad if find it later | 04:20 |
| mkrai | Thanks! | 04:20 |
| Qiming | sure | 04:21 |
| yanyanhu | hi, Qiming , you're right, ceilometer is using tooz to support api HA | 04:21 |
| yanyanhu | http://docs.openstack.org/ha-guide/controller-ha-telemetry.html | 04:21 |
| yanyanhu | typical use case | 04:22 |
| yanyanhu | will leave, talk to you guys later | 04:22 |
| adisky | hii | 04:23 |
| mkrai | hi adisky | 04:30 |
| mkrai | Bye yanyanhu | 04:31 |
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| adisky | so it is confirmed we will be using zun-scheduler?? | 04:41 |
| adisky | and on nova integration...the request has to pass two schedulers??? | 04:41 |
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| openstackgerrit | Merged openstack/python-zunclient: Add base files and service-list command https://review.openstack.org/337360 | 11:55 |
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| openstackgerrit | OpenStack Proposal Bot proposed openstack/higgins: Updated from global requirements https://review.openstack.org/344297 | 15:13 |
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