XSF Discussion - 2018-07-22


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  118. flow Ge0rG, why doesn't your client know? Don't you do local accounting too, so that you compare the expected handled count with the reported handled count?
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  138. Ge0rG flow: how is it supposed to? There is no corrective mechanism in 0198. You can only detect wrong x counting in one direction, not the other
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  233. flow Ge0rG, right, you can only detect miscounting of the other party. But that means the other party can detect miscounting of you. And both parties should terminate the stream if they detect it. win?
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  236. Holger Obviously only works if the other parties count is too large, while in Georg's case it was too low, no?
  237. jonasw exactly what Holger says
  238. jonasw flow, if you missed counting a few stanzas, you wouldn’t know (and the other party wouldn’t know either). you’d just assume that the most recent N stanzas were lost and you have to resend them
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  243. flow ok, that makes sense. But is the counter still off after the resend on resume?
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  245. jonasw but how would you know?
  246. flow assuming that all stanzas arrive and that the consuming client counts properly
  247. jonasw it cannot distinguish stanzas sent due to resumption and stanzas sent normally
  248. jonasw for all it knows, it just got a bunch of stanzas which might or might not be retransmissions
  249. flow does it need to distinguish?
  250. jonasw to detect a counter which is off, I think so
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  252. flow well, my question was if the counter would be still off after the resend on resume assuming that all stanzas arrive and that the consuming client counts them properly
  253. jonasw uh, I somehow misunderstood that
  254. jonasw I don’t even know what I did understand
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  256. flow I'm trying to figure out if the counter will be off for an extended period, or if it will sometimes/usually heal after the resumption
  257. flow but the main problem is a broken SM implementation, and those are always an issue (see SM in latest openfire)
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  259. jonasw flow, I guess this depends on why the counter is off in the first place. If it is off for example because the client miscounts during resumption due to a race condition, it would (still) be broken after resumption.
  260. jonasw but yeah, the duplicate stanzas are, I think, a symptom of re-synchronising the counters
  261. jonasw so unless the counter gets disturbed again during the resumption, it should be in sync
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  264. Guus For the record, we disabled the SM implementation by default in Openfire, while the issue persists.
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  299. Ge0rG flow: after the other party receives a bunch of duplicates, the counters are "synchronized" again.
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  301. Ge0rG Now I have logs from both sides when it happens with prosody vs yaxim, and I'm sure it wasn't a change in yaxim, because I did some heavy log analysis when implementing SM
  302. Ge0rG I blame Link Mauve, for mod_cache_c2s_caps
  303. Link Mauve Oh?
  304. Link Mauve How could that trigger c2s 0198 miscount? :o
  305. Link Mauve Especially in this direction.
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  307. jonasw eating stanzas before they enter the stream but after they were counted?
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  309. Ge0rG Luckily the client never receives the stanza in question, and the server doesn't log c2s out.
  310. Ge0rG So I can't prove it
  311. Ge0rG And of course I meant mod_auto_answer_disco_info
  312. jonasw that seems realistic
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