Hi,
I am glad somebody has responded to my post :-)
Without tests I can't really say how much the resource usage would
grow
but I can imagine it could be significant.
One of the reason for a good performance in Tigase server is a very
lightweight XML parser I have written.
Just so you know, that parser is not a conforming XML parser. Tigase
happily accepts data that is not XML-well-formed, and happily routes
or delivers it.
That's true but please note that XMPP stream is not really XML stream
either.
I would rather call my parser: XMPP parser then.
And please note. All these increased resource usage would be only
needed
because _sometimes_ it _may_ happen that maybe 1/1mln packet might
have
incorrect XMLNS......
I am not sure if this is worth the cost.
What is the cost? Has anyone actually tried determining the actual
cost?
I just don't think the cost of simply validating namespaces is
significant, and it certainly is not prohibitive.
This cost might be ignored on the client side but on the server side
everything counts. Imagine you have to parse XMPP packets on
150k active connections. The traffic during my load tests was
10k packets/sec. Every instruction you add to the data processing is
multiplied by the number of packets.
Of course if the XMLNS validation would be 1% of all operations
performed by the parser it could be probably ignored.
I think, however that XMLNS validation could require even
more processing than all other parser tasks.
Artur
--
Artur Hefczyc
http://www.tigase.org/
http://artur.hefczyc.net/
