Thank's for your reply.
All the failing queries was on the following model
SELECT distinct ?candidate ?label WHERE {
SERVICE wikibase:mwapi {
bd:serviceParam wikibase:api "EntitySearch" .
bd:serviceParam wikibase:endpoint "www.wikidata.org" .
bd:serviceParam mwapi:search "Musée Cernuschi" .
bd:serviceParam mwapi:language "fr" .
bd:serviceParam wikibase:limit 5 .
?candidate wikibase:apiOutputItem mwapi:item .
}
?candidate wdt:P17 wd:Q142 .
SERVICE wikibase:mwapi {
bd:serviceParam wikibase:api "EntitySearch" .
bd:serviceParam wikibase:endpoint "www.wikidata.org" .
bd:serviceParam mwapi:search "Paris" .
bd:serviceParam mwapi:language "fr" .
bd:serviceParam wikibase:limit 5 .
?city wikibase:apiOutputItem mwapi:item .
}
?candidate wdt:P131 ?city .
?candidate rdfs:label ?label;
filter(lang(?label)="fr")
}
I don't think that are queries producing big load.
I had a lot of response sometimes empty, sometimes correct on such
query testing the same query several times.
But, I can't reproduce such results this week. And, so, it is
difficult to analyze the problem without reproducing it.
--
Jean-Claude Moissinac
Le mer. 9 janv. 2019 à 00:29, Stas Malyshev <[email protected]> a
écrit :
> Hi!
>
> > Is there a good mean to query the sparql wdqs service of wikidata?
> > I've tried some python code to do it, with relative success.
> > Success, because some requests gives the expected result.
> > Relative, because the same query sometimes gives an empty response
> > either from my code or directly in the WDQS interface, where it's
> > possible to see that a sparql query sometimes gives an empty response,
> > sometimes the expected reponse without message or status to know that
> > the response is erroneous.
> > (demo is difficult, because it seems to depend of the load of the wdqs
> > service)
>
> Looks like you're running some heavy queries. So the question would be,
> which queries are those and how often do you run them?
>
> > I've found the following info:
> > *
> >
> https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Query_limits
> ,
> > which suggest a possible error HTTP code |429, which I never receive|
>
> 429 means you're calling the service too fast or too frequently. If you
> are just running a single query, you never get 429.
>
> > * https://phabricator.wikimedia.org/T179879, which suggest a possible
> > connexion with OAuth, but such possibility is never documented in the
> > official documentation
>
> https://phabricator.wikimedia.org/T179879 is an open task, thus it's not
> implemented yet.
>
> > None of them gives a practical method to get a response and trust it.
>
> Any method that uses HTTP access to SPARQL endpoint would give you the
> same result. Which depends on query. So I'd suggest providing some info
> about the queries and specific issues you're having, and then we could
> see if it's possible to improve it.
>
> --
> Stas Malyshev
> [email protected]
>
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