#metabrainz

O’Moin

lucifer: I’ve run your drafted patch to SIR with sqltimings and put logs under ~musicbrainz/sir-perf-reg/ on wolf; It slightly improved only.

[musicbrainz-server] 14reosarevok opened pull request #2710 (03master…type-constraint-genre): [WIP] Fix Perl type constraint issues in Selenium tests https://github.com/metabrainz/musicbrainz-serve...

yvanzo: oh :(, will take a look again then

weird that the sql queries decreased but it didn't improve much.

I switched critiquebrainz.org (as well as beta.cb) to use new gateways, I switched picard.musicbrainz.org and meta.metabrainz.org 2 days ago.

lucifer: it improved still :)

mooin!

lucifer: when you have a moment to chat about the similarity stuff, lemme know

atj: have a look at https://stats.metabrainz.org/goto/M8gHZoN4z?org...

lucifer: damselfish didn't get daily jams today. :(

response time seems to degrade, but I'm not sure why yet (it is the response as measured by openresty and stored in logs). We need to investigate this before moving more services to new gateways. For now, I have no explanation.

hmmm, something wrong with data representation

yup, I know what's happening (more or less), to get correct values (well, almost, since that's a mean of means), be sure to only select rex+rudi in host selector

when comparing this way, no significant difference (and that's expected)

atj: check https://stats.metabrainz.org/goto/QER-MoHVz?org... for a better way to compare

ignore kiki values after the switch (it is based on very few check queries, so not representative at all)

ah, ok

so it looks pretty good to me

the performance actually improves, but keep in mind rex/rudi have very low load for now

when did you do the switch for CB?

8:08 UTC

(well, around, because DNS TTL is 5 minutes, so that's progressive)

OK, so mean request time on kiki was ~40ms and rex/rudi it seems to have settled ~25ms

but kiki was handling much more traffic

yes

traffic is very low on switched websites, we'll have better figures when we'll switch coverartarchive (and mb ofc)

will be interesting to see given we have an extra layer on the new gateways

according to my measurements, extra layers should have minimal impact: we have the load balancer, then haproxy then openresty, and they use proxy protocol (which means an extra step and lower mtu)

but all this is very fast (few ms)

and the servers are faster

yes, and much more scalable

mayhem: i see, why that happened. jukevox, alastair etc also didn't get daily jams for same reason 🤦

on https traffic (which is cpu intensive) new setup should be much better overall

[listenbrainz-server] 14amCap1712 opened pull request #2223 (03master…fix-dail-jams): Fix error handing in daily jams https://github.com/metabrainz/listenbrainz-serv...

One thing missing is moving keydb to rex/rudi (they use kiki/herb ones still)

can we start putting docker volumes in /srv or something going forward?

yes, especially openresty

too many containers with volumes in /home/zas ;)

yup, I agree

I'll not switch more domains until we set up missing parts, the idea here was to get some real traffic in order to detect potential issues

it's a good idea to do it this way

I'm not sure about minio, stuff like this gives me pause "MinIO strongly recommends production clusters consist of a minimum of 4 minio server nodes in a Server Pool for proper high availability and durability guarantees."

but then the alternatives look worse

building a proper MinIO cluser is going to cost €€€

alastairp: monkey : can you please reply to the last.fm rec/UX doodle soon?

Yus

atj: yes, I'm not sure either

I tried opening it yesterday but it wasn't workign for me, will try again

mayhem: i am around now as well to discuss similar recordings.

[listenbrainz-server] 14amCap1712 merged pull request #2223 (03master…fix-dail-jams): Fix error handing in daily jams https://github.com/metabrainz/listenbrainz-serv...

ok, cool.

I was playing with the similarities last night and noticed a few things.

First off, the 7 day data is pretty bad.

i see

which makes little sense, because the first dataset you had a few days ago was even smaller and it was... kinda good.

so, I can't explain that. might've been a fluke.

the next realization is that I had an insight, but that insight hasn't been tested yet.

namely, if we train on too much data, that our data set tends towards noise.

I dont know if that is actually true.

we can train on 180-365 days to test that?

so, I would like to train data sets on: 30d, 90d, 180d, 1year, 3 year, 10 year, all time data sets.

sounds good

but we'll have to use appropriate thresholds to keep lookups fast

and then my goal is to pick a number of tracks as seed tracks and study them.

yes, that is a good point. can we make the thresholds relative to the amount of data?

so that it picks itself in a way?

hmm not sure. at max 100 or 200 similar recordings for each track maybe?

do you do any pruning of the data while you are generating it or is the pruning one of the last steps?

last step.

then yes, lets say we pick max 200 tracks for the next round.

and then we remove the threshold concept?

well, swap these concepts?

I think total count is a better way of doing this.

i am thinking to use both. 200 max but only if the track meets the threshold, say 5 or 10.

can we please try without threshold first?

I would like to see what that is like. it might work better.

because right now I want to see what the long tail for some of this data is.

sure. can try.

so 200 tracks per recording without threshold?

yes.

👍

great.

another q: are hated tracks filtered post CF data generation?

nope currently we don't do anything with loved/hated tracks

but that would be the right place to do this, no?

yes right.

let me put that on your todo list as something to do when you have some time.

at least the hated bit -- that doesn't involve another round of CF tuning.

where should we do it? spark, LB ingest, LB query time?

3 degrees of responsiveness

I was thinking post CF generation. take all the generated tracks from CF and remove all the ones that appear in the user's hated list.

but I am not married to that approach.

I think a more comprehensive approach is to tune the inputs to CF so that CF knows all about this.

yes makes sense, let's start there and see where to go from there.

but I am hesitant to get into a round of CF filtering right now. it seems to be working and I feel like focusing on other things.

great!

mayhem: done. I put a maybe on tues because it's holiday here, not sure what I'll be doing

seems that we're leaning towards thursday anyway.

thanks

yep, thursday it is. will send meeting invite later.

ok

alastairp: lucifer : right now the cover art stuff is in a separate repo (initial goals where unclear) and is being served from a different URL.

these endpoints might get a lot of traffic in the future -- not sure.

should this code be integrated into the LB codebase and simply be made a new endpoint or two or should we start a new docker container?

integrate now., move later?

zas: atj_mb: you two about for this question?

I think integrate now/move later is better

is the python code fast?

sounds good to put in LB for now. when we want to publicize it or show it on lb.org etc, move

its a question about future growth and I wonder how the new gateways impact this.

keeping it in the same codebase but starting a new container for it should be straightforward too

alastairp: there isn't much slow stuff in the code, but it does need to make requests to the DB to resolve IDs.

and with the new gateways it should be easy to slice one endpoint and have it go to a new server, or?

I'll proceed with a PR into the codebase for now. loads easier.

mayhem, i created daily jams now for all users who didn't jams yesterday.

thank you!

o/

"cover art stuff" being the code to create the grids?

yeah, we already send specific URLs/domains to different containers in the gateways (like websockets)

atj: yes.

atj: this is a general traffic growth question.

does it ever matter for us to move heavy traffic things to a separate sub-domain or should we always assume that we can do per-URL level routing to back-ends?

right, well the new gateways should be able to handle a lot more traffic, however I don't think the gateways are the bottleneck generally

can we?

agreed -- this convo is more about the user's perspective and not having to move redirect to new subdomains for when traffic grows.