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Re: Re ISSUE-58: Dublin Core server load

From: Mark Nottingham <mnot@mnot.net>
Date: Wed, 28 Apr 2010 09:59:17 +1000
Cc: www-tag@w3.org
Message-Id: <4003B062-B6AF-4B91-B1D0-CB4593B89616@mnot.net>
To: Jonathan Rees <jar@creativecommons.org>
I checked a few random DC purls:

http://redbot.org/?uri=http%3A%2F%2Fpurl.org%2Fdc%2Fdcmitype%2FImage
http://redbot.org/?uri=http%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F
http://redbot.org/?uri=http%3A%2F%2Fpurl.org%2Fdc%2Fterms%2F

... and it seems like all of them are served stale, so most caches won't use them. It seems like this is PURL's fault, not necessarily clients'.

Cheers,


On 28/04/2010, at 4:05 AM, Jonathan Rees wrote:

> Please attach to ISSUE-58 (scalabilityOfURIAccess-58)
> -Jonathan
> 
> ---------- Forwarded message ----------
> From: Thomas Baker <tbaker@tbaker.de>
> Date: Tue, Apr 27, 2010 at 1:03 PM
> Subject: Re: [pedantic-web] Missing DC property definitions?
> To: pedantic-web@googlegroups.com
> 
> On Tue, Apr 27, 2010 at 05:23:49PM +0100, Antoine Zimmermann wrote:
>> Actually, the problems comes from purl.org, which is not accessible at
>> the moment. [UPDATE: it was not accessible a few minutes ago]
>> This is not the first time it happens.
>> Now it works again, and your file validates without any warning.
> 
> See an interesting thread starting at [1], where Dave Wood says:
> 
>    On Friday, 26 March, Ian Davis (CTO of Talis) reported that
>    purl.org was rejecting some requests to Dublin Core PURLs
>    [1].  I asked OCLC to increase the number of threads used
>    by their PURL server and the maximum number of concurrent
>    connections.  They complied this afternoon.
> 
>    At the time of the failures, OCLC reported that purl.org
>    was rejecting between 20 and 60 requests per second for
>    DC terms [2].
> 
>    It would seem that Linked Data clients are becoming more
>    prevalent and that some of them are not particularly
>    well behaved.  Perhaps we need to raise awareness of the
>    importance of caching.
> 
> Tom
> 
> [1] https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind1003&L=DC-ARCHITECTURE&P=29894
> 
> --
> Tom Baker <tbaker@tbaker.de>
> 
> --
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> 


--
Mark Nottingham     http://www.mnot.net/
Received on Tuesday, 27 April 2010 23:59:50 GMT

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