Process-one
ejabberd
ejabberd@conference.process-one.net
Wednesday, June 27, 2018< ^ >
zinid has set the subject to: ejabberd discussions: https://docs.ejabberd.im
Room Configuration
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GMT+0
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[00:12:28] <Holger> !version conversations.im
[00:12:30] <Servant> Holger: conversations.im is running ejabberd version 18.04.9-conversations.im on unix/linux 4.9.0
[00:12:36] <Holger> Good night.
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[04:08:24] <ta> Holger: do you mind giving some information on the exact hardware you moved to? Just to get an impression what conversations.im needs?
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[04:24:10] <rom1dep> ta: a Datacenter of three raspberry pis
[04:24:21] <rom1dep> And a toaster
[04:38:49] <Licaon_Kter> rom1dep: clustering? Niiice
[04:41:32] <rom1dep> Licaon_Kter: Yeah, the tartine serialization protocol from the toaster standard output gave some headache, but the developer's dogfooding helped a lot in the process 😁
[04:42:11] <Licaon_Kter> rom1dep: buzzword bingo
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[06:18:30] <ta> rom1dep, i heard the Pi1 runs ejabberd just fine
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[06:25:44] <rom1dep> Yup
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[06:37:43] <Holger> ta: Well now it's oversized, we have bare metal with 4 Xeon cores and 32G RAM, half of that would do the trick. The bottleneck has always been the I/O pressure on SQL (especially while backup or an SQL dump are running). We worked around that by assigning most of the RAM to SQL caching, but now we have two SSDs (in a RAID-1), that'll solve our problems I guess.
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[06:49:43] <rom1dep> Holger: still mysql? didn't use the opportunity to go for pg?
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[06:53:03] <flow> Holger, do you have an idea how much of that I/O pressue on the database backend originates from MAM?
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[07:18:52] <ta> Holger, thanks for the heads up. It's interesting to see, how bigger commercial servers solve problems, compared to my chosen main server, trashserver. Well the name.... ;-)
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[07:24:42] <Licaon_Kter> ta: any issues with trashserver?🤔
[07:26:36] <ta> not at the moment. But i don't get angry at spare time admins, so i tolerate havin issues from time to time.
[07:27:16] <ta> but trashserver uses prosody, so probably the wrong channel here anyway ;-)
[07:30:58] <daniel> flow, i think it is fair to assume that MAM is responsible for a lot of the work. but since ejabberd hits the db on almost anything it does a slow db will bring everything to a grinding halt
[07:32:16] <daniel> we 'solved' it by just putting the entire index for the mam table in RAM basically
[07:33:54] <Holger> rom1dep:
> still mysql? didn't use the opportunity to go for pg?
Well I'm not sure how easy it is to migrate.  Apart from that I'm not sure whether Postgres would've been as good at working around the I/O bottleneck.  I'm clueless when it comes to SQL engines, but from what I've read (and the Internet is never wrong) it's not as good at caching as MySQL is, and InnoDB might also be more efficient for us than the Postgres backend.
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[07:34:48] <Licaon_Kter> ta: +1
[07:35:42] <daniel> yes. while my db knowledge isn’t much greater than Holgers but i don’t think for the kind of queries/load we have postgress is any better than mysql
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[07:58:31] <rom1dep> Yep perhaps. MAM needs a more efficient mechanism anyway
[07:59:05] <rom1dep> It should be possible to bundle compressed logs and send them out of stream to the client
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[08:38:44] <zinid> flow,
> do you have an idea how much of that I/O pressue on the database backend originates from MAM?
I my benchmarks (which I'm trying to make as close to real usage as possible) MAM queries are extremely dominant, 90% for sure
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[08:57:31] <flow> zinid, daniel, Holger, thanks for your feedback
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[08:58:38] <zinid> Holger, if you don't want to migrate to pgsql then you should remove full text indexing on mam table
[08:59:04] <zinid> Holger, it's not used anyway, not sure why it's enabled by default in the schema
[08:59:47] <edhelas> zinid it's the same thing for Movim actually, even if I have some optimizations to do, MAM is stressing a lot the DB
[09:00:47] <zinid> yeah, add here http upload and you're fucked 🙂
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[09:02:28] <Holger> zinid: You mean because real world clients don't do full text search?
[09:02:47] <zinid> yes, that feature was implemented for customers
[09:03:01] <edhelas> I think that full text search from the server is a bad idea
[09:03:19] <zinid> this full text indexing is degrading performance of mysql writes a lot, like several times, so consider it
[09:03:45] <Holger> > I my benchmarks (which I'm trying to make as close to real usage as possible) MAM queries are extremely dominant, 90% for sure
Yes I'm sure that's true for us as well.
[09:03:54] <Holger> zinid: Good idea.
[09:05:17] <zinid> we also need some mechanism to *fully* offload http uploads to haproxy or nginx
[09:06:10] <zinid> I mean not only GETs
[09:06:47] <zinid> I think nginx has some module where he transfers request headers and waits for the command
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[09:07:21] <zinid> any nginx/haproxy experts here?
[09:08:45] <rom1dep> Eh, I do Apache!
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[09:09:48] <Holger> zinid: Prosody has this: https://modules.prosody.im/mod_http_upload_external.html
[09:10:02] <zinid> Holger, they support PUTs?
[09:10:13] <Holger> Yes.
[09:10:28] <zinid> ah
[09:10:33] <zinid> well we need that too
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[09:11:05] <zinid> Implementations
    PHP implementation
    Python3+Flask implementation
[09:11:07] <zinid> lolwut?
[09:11:21] <Holger> The module produces a signed URL so the HTTP service can verify it.
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[09:12:49] <zinid> yeah, but what service?
[09:12:53] <zinid> that python3 crap?
[09:13:20] <zinid> I'm talking about highload here, not about those toys for localhost admins (who loves prosody)
[09:15:53] <Holger> Well the question is whether the concept is sane.
[09:23:59] <zinid> isn't it sane to move HTTP load on a specialized servers? HTTP PUTs are not cheap (as well as GETs if TLS is used)
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[09:24:57] <zinid> consider a usage where users share pictures frequent, like instagram clone
[09:26:04] <Holger> Yes!
[09:27:05] <Holger> I just wanted to mention the HMAC idea as an alternative to the Nginx thing you mentioned. Which I don't even know, so no idea what's better.
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[10:31:07] <zinid> Holger, now xdata codec supports multiple namespaces!
[10:31:11] <zinid> see https://github.com/processone/xmpp/blob/master/specs/http_upload.xdata
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[12:34:40] <Holger> Ah that's highly useful.
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[13:51:06] <nosnilmot> is ejabberd 18.06 expected "soon" ?
[13:51:48] <zinid> nosnilmot: yes
[13:51:58] <zinid> Friday I guess
[13:52:06] <nosnilmot> excellent, thanks!
[13:52:10] <zinid> cromain: ?
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[13:52:53] <zinid> I am closing my own 18.06 milestones
[13:53:26] <edhelas> omagad, it's happening
[13:53:44] <zinid> edhelas: pfff, not the first time
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[13:56:26] <cromain> yes, friday
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[14:01:42] <edhelas> release on friday, yolo
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[14:09:55] <cromain> i also fixed osx installers
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[14:25:00] <vanitasvitae> Will https://github.com/processone/ejabberd/issues/2483 be fixed in the upcoming release, or does that take some more work?
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[14:38:28] <cromain> vanitasvitae: no, i add this for 18.08
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[14:45:29] <zinid> I'm on it right at the moment
[14:45:34] <zinid> so probably will be fixed
[14:45:40] <zinid> but this requires some work, yes
[14:47:02] <zinid> but I'm still surprised why it's allowed to request disco from unsubscribed user
[14:47:04] <cromain> i don't have time on my side
[14:47:09] <zinid> this is JID harvesting
[14:47:24] <zinid> cromain, I assigned this issue to me a few days ago 🙂
[14:47:46] <cromain> i see, well if you can cope with it, i let you change milestone if ready before we tag
[14:47:52] <zinid> that's not pubsub issue anyway, that's a problem of mod_disco and its hooks
[14:48:32] <zinid> vanitasvitae, requesting disco in this way is "JID harvesting"
[14:48:50] <zinid> you will know the account exists
[14:49:08] <vanitasvitae> Ah i see
[14:49:27] <zinid> is this described somewhere in some XEPs?
[14:49:57] <zinid> I started to fix this "issue" and the solution is very ugly, with breaking hooking API
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[14:50:58] <zinid> urn:xmpp:openpgp:0:public-keys?
[14:51:01] <zinid> what XEP is this?
[14:51:06] <vanitasvitae> 373
[14:51:33] <zinid> and the author is okay with JID harvesting?
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[14:53:10] <vanitasvitae> by the look of things, 373 says nothing about the open access model
[14:54:31] <zinid> I'm not sure open access model on user's JID is a great idea
[14:55:27] <vanitasvitae> daniel wrote about this in the context of OMEMO: https://gist.github.com/iNPUTmice/7c52785ed69787516abb60e31703dbd2
[14:56:50] <zinid> well I'm lazy to read all this 🙂
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[15:05:27] <zinid> Ok, I better postpone the issue until this is clarified
[15:06:25] <zinid> Seems like OMEMO works without this requirement?
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[15:07:15] <vanitasvitae> I will ask Daniel for more information, maybe we can start some kind of dialog in standards@
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[15:11:27] <daniel> the requirement of changing the access model or the requirement of listem them in the disco#info?
[15:13:14] <zinid> listing
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[15:16:07] <daniel> from reading the blog post and the ejabberd issue this seems to be a smack limitation
[15:16:19] <daniel> or i missunderstood something
[15:18:15] <zinid> no idea 🙂 We're only asked to return disco#info even when there is no subscription 😉
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[15:20:22] <zinid> we can probably return empty response for every JID even if the JID doesn't exist?
[15:20:28] <zinid> will it solve the issue?
[15:20:42] <zinid> ah, probably not
[15:21:12] <daniel> just fix smack?
[15:22:00] <daniel> maybe vanitasvitae can clear this up but i don’t understand why smack needs to query disco#info before quering a pep node
[15:25:17] adrien leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
[15:27:12] jeremy leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
[15:27:28] <vanitasvitae> daniel: smack queries disco in order to determine the node type (leaf node, collection node) and other information
[15:29:33] <daniel> yeah but in this particular instance it doesn’t seem like you need it
[15:29:45] <daniel> because you know what node to exepect right?
[15:29:59] <nosnilmot> zinid, I can reproduce 2488, let me know if I can be of any assistance
[15:30:35] ingolf leaves the room: Disconnected: Replaced by new connection
[15:31:51] <zinid> the fuck...
[15:31:57] <zinid> OTP21?
[15:32:00] <nosnilmot> yes
[15:32:10] <zinid> seems like they changed the API
[15:32:16] <zinid> no compile errors?
[15:32:37] <zinid> no warnings?
[15:32:44] <nosnilmot> I didn't actually recompile ejabberd with it yet... hold on
[15:33:36] <zinid> nosnilmot, can you please look at which function crashes? the last one?
[15:33:50] <zinid> remove them line by line starting from the bottom
[15:35:31] <zinid> I guess `public_key:der_decode('PrivateKeyInfo', Der)` is failing
[15:37:38] <nosnilmot> this is the line that causes it to fail - it isn't crashing, but it doesn't have a privateKey member
#'PrivateKeyInfo'{privateKey = Key} = public_key:der_decode('PrivateKeyInfo', Der).
[15:38:18] <zinid> but why it decodes straight into RSAPrivateKey?
[15:38:23] <zinid> what the fuck is going on?
[15:39:42] <zinid> nevermind, I'll fix this
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[16:05:15] <nosnilmot> https://github.com/erlang/otp/commit/304dd8f81e28ed04cde9f6f7ac1f79870da1c2cd#diff-b5140c7c74f626f9f0ad2c1113324bd6L240
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[16:16:24] Andrew Nenakhov leaves the room: Connection failed: connection closed
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[16:22:00] <Licaon_Kter> zinid:
> So I close the issue until this is not clarified
Waht?
That `not` should not be there!?🤷
[16:22:01] J. King leaves the room
[16:23:22] <zinid> nosnilmot, yeah, good job, fuckers 🙂
[16:23:34] xinit leaves the room
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[16:24:28] <zinid> nosnilmot, I added a comment on the commit!
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[16:28:25] <zinid> damn, I need to install OTP21 myself
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[16:30:44] <zinid> https://github.com/max-au
[16:30:52] <zinid> the dude from whatsapp
[16:31:09] <zinid> they are breaking ejabberd on purpose? hm...
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[16:51:24] <zinid> Holger, any chance on https://github.com/processone/ejabberd/issues/2485 by this Friday?
[16:52:12] <zinid> not pressing, just let me know, I need to set the milestone
[16:52:53] <nosnilmot> he's not going to be watching any more soccer...
[16:53:12] <zinid> why? Germany kaput?
[16:53:17] <nosnilmot> aye
[16:53:28] <zinid> LOL, champions my ass
[16:53:42] <vanitasvitae> Finally Silence 🙂
[16:54:19] <zinid> what about Russia btw, anybody tracking?
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[16:56:47] <nosnilmot> Russia's through to the knockout stage
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[17:00:33] <ThUnD3r|Gr33n®> zinid: kaputt
[17:03:04] jeremy leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
[17:06:44] <zinid> ThUnD3r|Gr33n, sorry!
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[17:51:54] <flow> I don't think there is anything to fix on Smack's side. PubSub services are required to return disco#info
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[17:55:04] <vanitasvitae> If you have a pubsub node with access model open, you can check whether the jid exists or not even without disco
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[17:58:01] <flow> yep, course not revealing that an account exists on disco#info on non-open pep nodes may be sensible, but given the trend to actually make use of open nodes, it probably won't buy you much
[18:00:36] <rom1dep> https://code.facebook.com/posts/201318390519340/migrating-messenger-storage-to-optimize-performance/
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[18:01:12] vogt leaves the room: Connection failed: connection closed
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[18:19:12] <Licaon_Kter> https://code.fb.com/core-data/migrating-messenger-to-optimize-performance/
rom1dep: yours 404s
[18:20:23] <J. King> It didn't when I tried it, but it does now.  Weird.
[18:20:32] <rom1dep> funny, it's been removed
[18:21:04] <J. King> Silly Facebook.  That's what 410 is for. :P
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[18:48:45] <Licaon_Kter> Reading Facebooks tech posts in kinda fun, as Googles too, the scale where they operate in mind boggling...and then I remember what their products are....and the smile turns to a frown 😔
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[18:59:08] <J. King> My frown is a permanent fixture. ;)
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[19:21:31] vogt leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
[19:24:18] <zinid> > the scale where they operate in mind boggling
Pfff...
[19:24:23] <zinid> Not for me \m/
[19:26:01] <zinid> mfoss, anchors don't work again: https://docs.ejabberd.im/admin/configuration/#mod_stream_mgmt
[19:26:35] <Holger> zinid: s/_/-/
[19:26:38] <Holger> zinid: https://docs.ejabberd.im/admin/configuration/#mod-stream-mgmt
[19:26:49] <zinid> ah
[19:26:58] <zinid> well, then the source should be fixed
[19:27:07] <zinid> because I took this anchor from that page directly
[19:27:22] <Holger> > any chance on https://github.com/processone/ejabberd/issues/2485 by this Friday?
I'm falling asleep but I can probably do it tomorrow.
[19:27:31] <zinid> Holger, sure
[19:27:39] <Holger> Or just update the milestone anyway.  That won't slow me down :-)
[19:27:50] <zinid> Okay 🙂
[19:28:25] <zinid> I'll set 18.06 to keep you toned!
[19:29:42] <Holger> Hehe, ok.
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[19:48:25] <mfoss> zinid: anchors should be generated automatically but I’ll take a look
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[21:07:15] <tester> Hello, ejabberd 18.04 Ubuntu, captcha for register is running with conversations, but not in with the web registration
[21:07:47] <tester> mod_register:
    ##
    ## Protect In-Band account registrations with CAPTCHA.
    ##
    captcha_protected: true
    ##
    ## Set the minimum informational entropy for passwords.
    ##
    password_strength: 32
    ##
    ## After successful registration, the user receives
    ## a message with this subject and body.
    ##
    welcome_message:
      subject: "Welcome!"
      body: |-
        Hi.
        Welcome to this XMPP server.
    ##
    ## When a user registers, send a notification to
    ## these XMPP accounts.
    ##
    registration_watchers:
      - "tester@example.com"
    ##
    ## Only clients in the server machine can register accounts
    ##
    ip_access: all
    ## trusted_network
    ##
    ## Local c2s or remote s2s users cannot register accounts
    ##
    ##   access_from: deny
    access: register
  mod_register_web: {}
[21:09:01] <tester> the captcha picture is not shown, I test with chrome and internet explorer
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[23:31:40] jeremy leaves the room: Machine going to sleep
[23:47:52] vogt leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
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