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| imaximets | Hi. | 17:24 |
|---|---|---|
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| dceara | Hi | 17:24 |
| * dceara is on and off online :( | 17:24 | |
| imaximets | mmichelson is not here today and I'm not sure who else is here. | 17:25 |
| imaximets | Maybe I can kick off the meeting and we'll finish it early if no-one else will appear. | 17:26 |
| zhouhan | Hi | 17:26 |
| imaximets | #startmeeting ovn_community_development_meeting | 17:26 |
| openstack | Meeting started Thu Apr 22 17:26:50 2021 UTC and is due to finish in 60 minutes. The chair is imaximets. Information about MeetBot at http://wiki.debian.org/MeetBot. | 17:26 |
| openstack | Useful Commands: #action #agreed #help #info #idea #link #topic #startvote. | 17:26 |
| openstack | The meeting name has been set to 'ovn_community_development_meeting' | 17:26 |
| zhouhan | seems the eavesdrop link is not updating? | 17:26 |
| imaximets | zhouhan, hi. | 17:27 |
| zhouhan | the last meeting notes was 2021-01-07 in the link :) | 17:27 |
| imaximets | hmm, seems the last log is form january... | 17:27 |
| imaximets | Someone will need to figure this out, I'm not sure who manages it. | 17:28 |
| zhouhan | someone from openstack ;D | 17:29 |
| dceara | imaximets: zhouhan: The correct link for the logs is here: http://eavesdrop.openstack.org/meetings/ovn_community_development_meeting/2021/ | 17:29 |
| imaximets | zhouhan, hmm, seems like the meeting name changed from ovn_community_development_discussion to ovn_community_development_meeting. | 17:29 |
| zhouhan | Ahh. Thx dceara | 17:30 |
| imaximets | so, we can conclude that it's mmichelson's fault. :) | 17:30 |
| dceara | zhouhan: Np, now we need to figure out how to get it updated, IIRC dalvarez set it up :) | 17:30 |
| zhouhan | so we are on the record now. we can start updating :) | 17:31 |
| dceara | :) | 17:31 |
| imaximets | we just need to use consistent names, I think. | 17:31 |
| dceara | imaximets: Ah, true. | 17:31 |
| imaximets | And, probably, ask dalvarez to move logs if possible to the old folder. | 17:31 |
| imaximets | I just copied from the last one. | 17:32 |
| imaximets | But let's start the meeting. :) | 17:32 |
| imaximets | I'll start with a small update | 17:32 |
| imaximets | For the last couple of weeks I worked on ovsdb 2-tier deployment. | 17:33 |
| imaximets | i.e. to allow running a series of replication servers that will replicate a main raft cluster, so the actual clients can connect to replicas instead. | 17:34 |
| imaximets | This should move a lot of load from the main raft cluster and increase scalability. | 17:34 |
| zhouhan | imaximets awesome! I have been talking about this for a while but never got to implement it | 17:35 |
| imaximets | one of the main problems is that current ovsdb replication works in read-only mode, so I implemented a transaction forwarding. | 17:35 |
| imaximets | if enabled, replication server will forward incoming transaction to the replication source. | 17:36 |
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| zhouhan | imaximets Oh, I thought we will have to make SB replicas read-only by ovn-controller. So instead of that you made the replicas writable? | 17:36 |
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| zhouhan | imaximets seems you disconnected? | 17:39 |
| imaximets_ | opps. got disconnected for some reason. | 17:39 |
| imaximets_ | zhouhan, yep. If you asked something, please, repeat. | 17:40 |
| zhouhan | Oh, I thought we will have to make SB replicas read-only by ovn-controller. So instead of that you made the replicas writable? | 17:40 |
| imaximets_ | I replied this (not sure if you received): replicas are not technically writable, because the do not execute transactions by their own, but forwards the transaction to the main cluster and forwards results back. | 17:41 |
| imaximets_ | s/the/they/ | 17:41 |
| zhouhan | Oh, I didn't see this reply. | 17:41 |
| imaximets_ | ovn-controller doesn't seem to execute a lot of "write" transactions, so this should be fine. | 17:43 |
| zhouhan | This is definitely more generic and less restricted by the use cases (e.g. when ovn-controller has to update the SB). It just seemed tricky to me to support it | 17:43 |
| zhouhan | It would be great if it can be done. | 17:43 |
| imaximets_ | I think, my implementation is straightforward enough. :) | 17:43 |
| zhouhan | Would the transaction ACID still be kept? | 17:43 |
| imaximets_ | zhouhan, all the same as with a usual ovsdb transaction. replica is just a proxy. | 17:44 |
| zhouhan | hmm... Maybe I thought something unnecessarily complex. This is great :) | 17:45 |
| imaximets_ | I hope to post the patch-set somewhere soon. Will add you in CC. | 17:45 |
| zhouhan | Cool! thx | 17:45 |
| zhouhan | I have a quick update | 17:47 |
| imaximets_ | The second part is that we need to keep HA, i.e. replicas should reconnect to active cluster member or clinet need to know that current replica syncs from the non-cluster member. | 17:47 |
| imaximets_ | zhouhan, let me finish a real quick. :) | 17:47 |
| * zhouhan sorry, please continue | 17:47 | |
| imaximets_ | I took the second approach. Implementation is to replicate a _Server database, so the client will receive the same information about the cluster as it is now. | 17:48 |
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| imaximets_ | It's a bit tricky, but doable without loosing a _Server database of the replication server itself. | 17:49 |
| imaximets_ | Will post this part along with transaction forwarding patches. | 17:49 |
| imaximets_ | That's it from me. | 17:49 |
| zhouhan | What's the problem of the first approach? | 17:49 |
| zhouhan | replicas always connect to active RAFT cluster member? | 17:50 |
| imaximets_ | zhouhan, the problem is current implementation of the replication code. Currently, replicas doesn't care where to connect and has no support for multiple remotes. | 17:50 |
| zhouhan | ok, so you are using the replication mode of OVSDB server instead of a standard RAFT client | 17:51 |
| imaximets_ | yes, replication server is not part of a raft cluster. it's a standard --sync-from replication. | 17:52 |
| zhouhan | I was thinking a proxy working as a client to the RAFT cluster and sit in front of the "replica" server. | 17:52 |
| imaximets_ | I thought about something like a non-voting cluster member, but it seems like a more invasive and complicated thing. | 17:53 |
| zhouhan | We can discuss more when you send out the patch. | 17:53 |
| imaximets_ | sure | 17:54 |
| zhouhan | I worked on the "table 45 flow explostion" problem, and sent a patch series: #link https://patchwork.ozlabs.org/project/ovn/list/?series=240294 | 17:54 |
| zhouhan | Also sent out some minor fixes | 17:54 |
| zhouhan | I forgot to add cover letter to the patch series so the title may be misleading. | 17:55 |
| zhouhan | dceara Please take a look if you can, since you also discussed the problem | 17:55 |
| dceara | zhouhan: Nice! I had a very brief look at the patch to fix the flow explosion, I hope to be able to have a closer look next week. | 17:55 |
| _lore_ | can I go next? quite fast | 17:55 |
| zhouhan | thx dceara | 17:56 |
| dceara | zhouhan: Np. | 17:56 |
| zhouhan | _lore_ please go ahead | 17:56 |
| _lore_ | this week I resumed CoPP work from dceara to rate limit control plane | 17:56 |
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| _lore_ | we have some spot we want to rate limit so this general approach can fix them at once doing it in the kernel | 17:57 |
| _lore_ | I rebased it ontop of ovn master and doing some tests, it works so far | 17:57 |
| _lore_ | I guess we can sync if this aprroach is fine for all | 17:58 |
| * zhouhan refreshing his memory of CoPP | 17:58 | |
| _lore_ | I guess I can add support for some lefover controller actions and post v1 | 17:58 |
| _lore_ | to continue the discussion | 17:58 |
| dceara | _lore_: Thanks for taking over that work! We might want to simplify it a bit though, the configuration part was too cumbersome in my RFC. | 17:59 |
| _lore_ | zhouhan: actually dceara added a new column in logical flow table | 17:59 |
| zhouhan | thanks _lore_ | 17:59 |
| zhouhan | dceara any idea why was the CoPP work paused? | 17:59 |
| _lore_ | yw :) | 17:59 |
| _lore_ | I like the generality of the approach | 17:59 |
| _lore_ | but maybe we can decide to simplify it | 18:00 |
| dceara | zhouhan: It seems that it just fell off my priority list in time :) | 18:00 |
| zhouhan | ok | 18:00 |
| _lore_ | there is a new table called CoPP to a list of meter devided for type like arp, nd, ... | 18:01 |
| _lore_ | so a logical switch, logical router or logical switch port can refer to a given row in the CoPP table to filter like arp, controller_event and so on | 18:02 |
| dceara | Not sure if it's useful now but this was the last CoPP RFC version I sent out: https://patchwork.ozlabs.org/project/openvswitch/list/?series=140778&state=* | 18:02 |
| _lore_ | dceara: I can share the updated one in my gh | 18:02 |
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| _lore_ | https://github.com/LorenzoBianconi/ovn/tree/CoPP | 18:03 |
| dceara | _lore_: Nice, looking forward to the patches on the mailing list! | 18:04 |
| numans | I can go real quick if _lore_ is done. | 18:05 |
| imaximets | numans, go ahead, I guess. :) | 18:06 |
| numans | I did some reviews this week. | 18:06 |
| numans | And submitted v4 of the ct inv patch series. | 18:07 |
| numans | thanks mdgray for the review. | 18:07 |
| _lore_ | numans: sorry I am done :) | 18:07 |
| numans | zhouhan, Can you please take a look at these patches ? https://patchwork.ozlabs.org/project/ovn/list/?series=240351 | 18:07 |
| numans | and also this one please - https://patchwork.ozlabs.org/project/ovn/patch/20210412132029.675432-1-numans@ovn.org/ | 18:08 |
| numans | Right now I'm working on crash seen due to assert seen here - https://github.com/ovn-org/ovn/blob/master/controller/ofctrl.c#L1936 | 18:08 |
| zhouhan | numans sure, I will be in review mode next week | 18:09 |
| numans | Any comments on this are welcome. From the logs I see that there are many time related warnings. | 18:09 |
| numans | I am suspecting if a desired_flow->installed is NULL because ovn-controller couldn't send the flow to vswitchd. | 18:09 |
| numans | zhouhan, thanks. | 18:10 |
| numans | I am also suspecting this commit https://github.com/ovn-org/ovn/commit/c6c61b4e3462fb5201a61a226c2acaf6f4caf917 to be the cause of the regression | 18:10 |
| numans | that's it from me. | 18:10 |
| dceara | I have a one line update too: I've been chasing a bug in the Port.UP/ovn-installed "notification" mechanism (due to not retrying OVS transactions on failure), I have the patch ready, running some more tests, hopefully I can post it soon. | 18:11 |
| dceara | That's it from me. | 18:12 |
| imaximets | OK. Anyone else? Questions/Discussions? | 18:12 |
| imaximets | So, I guess, that's it for today. | 18:14 |
| imaximets | Thanks! | 18:14 |
| imaximets | #endmeeting | 18:14 |
| openstack | Meeting ended Thu Apr 22 18:14:28 2021 UTC. Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4) | 18:14 |
| openstack | Minutes: http://eavesdrop.openstack.org/meetings/ovn_community_development_meeting/2021/ovn_community_development_meeting.2021-04-22-17.26.html | 18:14 |
| openstack | Minutes (text): http://eavesdrop.openstack.org/meetings/ovn_community_development_meeting/2021/ovn_community_development_meeting.2021-04-22-17.26.txt | 18:14 |
| openstack | Log: http://eavesdrop.openstack.org/meetings/ovn_community_development_meeting/2021/ovn_community_development_meeting.2021-04-22-17.26.log.html | 18:14 |
| dceara | Thanks, bye everyone! | 18:14 |
| imaximets | bye | 18:14 |
| zhouhan | thanks, bye! | 18:16 |
| tryauuum | where can I read up on various approaches to connecting a park of OVN VMs to top-of-the-rack switches? I don't know anything about hardware switches and routers. As far as I understand, there are products (e.g. from cisco, that implent "vtep schema" that you can later integrate with OVN via ovn-controller-vtep. But what are other approaches? | 18:16 |
| tryauuum | ). Didn't want to interrupt the meeting :) | 18:17 |
| zhouhan | tryauuum: what do you mean by "connecting to TORs"? Do you mean TORs are part of overlay network? Then ovn-controller-vtep is the approach, but I am not sure if it is widely tested. | 18:19 |
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