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Re: SPARQL servers used in the LOD Cloud

From: Richard Cyganiak <richard@cyganiak.de>
Date: Fri, 1 Oct 2010 20:50:35 +0100
Cc: public-lod@w3.org
Message-Id: <761A84E0-FD8B-434F-A259-418D876C374D@cyganiak.de>
To: Yves Raimond <yves.raimond@gmail.com>

On 1 Oct 2010, at 14:29, Yves Raimond wrote:
>>> The list seems to miss all the SWI-Prolog endpoints for some reason,
>>> e.g. http://www.ckan.net/package/jamendo-dbtune
>>
>> That's because they were all 500 yesterday.
>
> Hmm. Weird, looks up now, and we didn't get any monitoring alert? Are
> you sure you tested with a query?

See below. Perhaps it doesn't implement HTTP HEAD?

Best,
Richard


curl -I http://dbtune.org/jamendo/sparql/?query=ASK+%7B+%3Fs+%3Fp+%3Fo+%7D
HTTP/1.1 500 Internal Server Error
Date: Thu, 30 Sep 2010 20:19:42 GMT
Content-Length: 826
Content-Type: text/html; charset=UTF-8
Connection: close




> Default behavior for SWI-Prolog is
> to return a 500 if the query is not set, which might have been the
> case here? e.g.:
>
> http://dbtune.org/jamendo/sparql/
> vs.
> http://dbtune.org/jamendo/sparql/?query=describe%20%3Chttp://dbtune.org/jamendo/sparql%3E
>
> Cheers,
> y
>
>
>>
>> From what I've seen, at any given time 10-20% of the LOD Cloud SPARQL
>> endpoints seem to be down ...
>>
>> Best,
>> Richard
>>
>>
>>>
>>> Cheers,
>>> y
>>>
>>> On Fri, Oct 1, 2010 at 2:02 PM, Jens Lehmann
>>> <lehmann@informatik.uni-leipzig.de> wrote:
>>>>
>>>> Hello,
>>>>
>>>> On 01.10.2010 14:08, Richard Cyganiak wrote:
>>>>>
>>>>> The real news here is that we now have more than 100 live SPARQL
>>>>> endpoints in the Cloud. I'm not going to attempt any further
>>>>> interpretation of this data, but it should be useful for anyone  
>>>>> who
>>>>> needs SPARQL endpoints for testing their client against.
>>>>
>>>> Very nice list. Good to see that there are a few endpoints around.
>>>>
>>>> This entry seems to be listed twice:
>>>> http://api.talis.com/stores/bbc-backstage/services/sparql
>>>>
>>>> A while ago I wrote a simple script for finding endpoints, which  
>>>> had the
>>>> output listed below. It may or may not be useful for you. There  
>>>> is no
>>>> guarantee that those endpoints are still working (and of course  
>>>> there is
>>>> an
>>>> overlap with your list). Last time I checked, some of those  
>>>> endpoints
>>>> didn't
>>>> really support SPARQL (failed on simple SELECT/CONSTRUCT/ASK  
>>>> queries).
>>>>
>>>> Kind regards,
>>>>
>>>> Jens
>>>>
>>>>
>>>> http://lod.openlinksw.com/sparql/
>>>> http://www.semantic-systems-biology.org/biogateway/endpoint
>>>> http://jena.hpl.hp.com:3040/backstage
>>>> http://dbtune.org/bbc/peel/sparql
>>>> http://dbtune.org/bbc/playcount/sparql
>>>> http://www4.wiwiss.fu-berlin.de/dailymed/sparql
>>>> http://semantic.data.gov/sparql
>>>> http://data.gov.uk/sparql
>>>> http://www4.wiwiss.fu-berlin.de/dblp/sparql
>>>> http://dbpedia.org/sparql
>>>> http://dbpedia-live.openlinksw.com/sparql/
>>>> http://www4.wiwiss.fu-berlin.de/diseasome/sparql
>>>> http://doapspace.org/sparql
>>>> http://www4.wiwiss.fu-berlin.de/drugbank/sparql
>>>> http://www.factforge.net/sparql
>>>> http://openflydata.org/query/flyatlas_20080916
>>>> http://openflydata.org/query/flyted_20081203
>>>> http://spade.lbl.gov:2021/sparql,
>>>> http://spade.lbl.gov:2020/sparql
>>>> http://dbtune.org/henry/sparql/
>>>> http://hcls.deri.org/sparql/
>>>> http://abdera.watson.ibm.com:8080/sparql
>>>> http://dbtune.org/jamendo/sparql
>>>> http://data.linkedct.org/sparql
>>>> http://data.linkedmdb.org/sparql
>>>> http://lod.openlinksw.com/sparql/
>>>> http://dbtune.org/magnatune/sparql
>>>> http://dbtune.org/musicbrainz/sparql
>>>> http://rdf.myexperiment.org/sparql
>>>> http://sparql.neurocommons.org/sparql
>>>> http://myopenlink.net:8890/sparql/
>>>> http://demo.openlinksw.com/sparql/
>>>> http://www4.wiwiss.fu-berlin.de/gutendata/sparql
>>>> http://www.rdfabout.com/sparql
>>>> http://revyu.com/sparql
>>>> http://*.rkbexplorer.com/sparql/
>>>> http://data.semanticweb.org/sparql
>>>> http://sparql.semantic-web.at/sparql
>>>> http://www.sparql.org/sparql
>>>> http://www.wasab.dk/morten/2005/04/sparqlette/
>>>> http://zbw.eu/beta/sparql
>>>> http://www4.wiwiss.fu-berlin.de/is-group/sparql
>>>> http://lsd.taxonconcept.org/sparql/
>>>> http://uriburner.com/sparql/
>>>> http://void.rkbexplorer.com/sparql/
>>>> http://www.w3c.es/Prensa/sparql/
>>>> http://dannyayers.com:8888/ontoworld/
>>>> http://www4.wiwiss.fu-berlin.de/factbook/sparql
>>>> http://api.talis.com/stores/periodicals/services/sparql
>>>> http://km.aifb.uni-karlsruhe.de/services/sparql
>>>> http://my.opera.com/community/sparql/sparql
>>>>
>>>> --
>>>> Dipl. Inf. Jens Lehmann
>>>> Department of Computer Science, University of Leipzig
>>>> Homepage: http://www.jens-lehmann.org
>>>> GPG Key: http://jens-lehmann.org/jens_lehmann.asc
>>>>
>>>>
>>
>>
Received on Friday, 1 October 2010 19:51:11 UTC

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