Hi all,
I am recurringly running into the following kind of error:
Virtuoso 42000 Error CL...: cluster distributed fragment message went missing
for too long, probable network error sending to 2
A sample query provoking this behavior is
SELECT (count(?x) AS ?c)
WHERE
{ ?z0<http://dbpedia.org/ontology/genus> ?x .
?z0<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://dbpedia.org/ontology/Mollusca> .
?z1<http://dbpedia.org/ontology/genus> ?x .
?z1<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.w3.org/2002/07/owl#Thing>
OPTIONAL
{ ?y<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://dbpedia.org/class/yago/GastropodGeneraWithSingleSpecies>
FILTER sameTerm(?x, ?y)
}
FILTER ( ! bound(?y) )
}
Any ideas?
Best regards,
Heiko.
--
Dr. Heiko Paulheim
Knowledge Engineering Group
Technische Universität Darmstadt
Phone: +49 6151 16 6634
Fax: +49 6151 16 5482
http://www.ke.tu-darmstadt.de/staff/heiko-paulheim
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