Hi Ruben,
I understand the theory and motivation behind LDF (I did read your paper
;-) but appealing ideas do not always turn out to work well in practice.
Of course all the issues I observe might be due to implementation. Maybe
the general idea could still be made to work somehow. All I am doing is
running queries and seeing what I get. Unfortunately, so far, I have not
found many queries that return results at all (caveat: I cannot test
very quickly since each query takes very long to run). What I was trying
so far:
* "Brad Pitt" from the first page: 55sec in Firefox, but only 6sec in
Chrome (!). Results are not really correct, but as you said that this
should be fixed soon.
* "Rivers in Antarctica" (with all label fetching triples removed) This
is really a rather direct query, with merely one OPTIONAL and three
triple patterns in total. It ran for about 5 min before stopping and
clearing the timer (no results shown).
* "Overall causes of death ranking" No luck there. terminated with no
results. Timer resets sometimes for some reason.
* "Largest cities of the world" (with labels fetched by the plain SPARQL
method as in the example query) This one got me a *server-side* timeout
message after 5min of waiting; I would paste it here but the UI has
reset itself before I could copy it.
* "Most eponymous mathematicians" (with all labels and the unsupported
SAMPLE clause removed) I left that run for over an hour now. Still no
result. The timer resets once in a while (it is at over 1900sec again as
I write this). The query (with labels) took 3sec on Blazegraph.
Maybe I am just trying the wrong queries? Do you have a sample query
from the Wikidata query samples that you would recommend as a good showcase?
Best regards,
Markus
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