IMs and group IMs (was Re: [sldev] Frequent bugs with difficult repros)

[Matthew Dowd]

>> The IMs and group IMs issue is indeed independant of the protocol. IMs
>> used to work just fine in UDP before LL made one of its most catastrophic
>> mistakes by changing the architecture for IM communications in v1.14.1
>> ( http://blog.secondlife.com/2007/04/02/preview-of-second-life-11411-now-up-on-the-beta-test-grid/ )
>> to try and lighten the load on the servers.
>>
>> Despite a HUGE amount of bug reports and complaints, LL stubbornely kept
>> the changes they made and we are still now, 11 months after the problems
>> were identified, suffering the same out of order IMs, spuriously reopening
>> group sessions, failure to open group sessions and send group notices,
>> failures to set invisble or visible status in friends list (you are marked
>> either visible or not, but your friends see the opposite), failures to load
>> friends or groups lists after a cache emptying, etc, etc, etc...
>>
>> LL, please, STOP this madness and return to the OLD, reliable architecture,
>> simply using better pipes and more powerful servers to keep the IMs and
>> groups CENTRALIZED !
>>
>> Henri Beauchamp.
>> _______________________________________________
>>   
> 
> The concurrency record is now 65K simultaneous users. What was it 11 
> months ago and why do you think that the old way would work better with 
> the current load?

Tricky one - the concurrency back in March/April when the new IM architecture was introduced was about 30K-40K, so we have seen a load increase in the region of 75%. Whether the original architecture could have coped is a very good question.

However, the new architecture has had the faults that Henri mentions since the first day it was introduced - under the load of March/April 2007 the old architecture worked well, the new architecture had serious flaws (as yet not properly resolved).

Matthew
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