[MOBY-dev] Dead services and how to figure them out

[José María Fernández González]

But, what does it happen if a service provider suddenly "disappears" (e.g. DNS
failure)? If QoS is stored just besides the service host, the Central Registry
could not fetch the QoS information in that case.

And, what does it happen if a QoS service provider suddenly "disappears" (e.g.
again DNS failure)? Service is usable, service is reachable, but QoS isn't...

Also, QoS is perceived in a different way depending on the place where your
client is plugged. The real QoS of a japanese service is different when you
are in Japan than when you are in Europe.

So, I have just realized that perhaps a possible answer is having replicated
QoS metadata servers spread around the world, related in some way to MOBY Central.

	Just my two euro cents...
		José María

Martin Senger wrote:
>> I tend to have the opinion that only metadata necessary for discovery of a
>> service should be in the registry itself, and that metadata about QoS,
>> uptime, downtime, versioning, etc. all belongs somewhere else...  by
>> "somewhere else" I mean (a) in the hands of the service provider themselves,
>> or (b) in a third-party metadata repository.
> 
> 
> Exactly my opinion (strong or weak :-)). Let's not pollute the registry. The
> "smart" clients should anyway make some caches of the metadata so the
> concern about the performance is a weak one I believe.
> 
> Cheers,
> Martin
> 

-- 
"There is no reason why anybody would want a computer in their home" -
	Ken Olson, founder of DEC 1977
"640K ought to be enough for anybody" - Bill Gates, 1981
"Nobody will ever outgrow a 20Mb hard drive." - ???

"Premature optimization is the root of all evil." - Donald Knuth

José María Fernández González
Tlfn: (+34) 91 732 80 00 / 91 224 69 00 (ext 3061)
e-mail: jmfernandez at cnio.es		Fax: (+34) 91 224 69 76
Unidad del Instituto Nacional de Bioinformática
Biología Estructural y Biocomputación	Structural Biology and Biocomputing
Centro Nacional de Investigaciones Oncológicas
C.P.: 28029				Zip Code: 28029
C/. Melchor Fernández Almagro, 3	Madrid (Spain)

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