Timeout exception from LOD remote endpoints when performing queries with the
Entity Hub.
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Key: STANBOL-222
URL: https://issues.apache.org/jira/browse/STANBOL-222
Project: Stanbol
Issue Type: Bug
Components: Entity Hub
Reporter: Andrea Nuzzolese
The sparql constructs serialized by the Entity Hub that is used for querying
remote LOD endpoints contain OPTIONAL patterns that require too much time to be
evaluated.
An example is the following
CONSTRUCT { ... }
WHERE {
{ {?id <http://www.w3.org/2002/07/owl#sameAs>
<http://www4.wiwiss.fu-berlin.de/factbook/resource/United_States> }}
{ OPTIONAL { ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
?v_1 . } }
{ OPTIONAL { ?id <http://www.w3.org/2000/01/rdf-schema#label> ?v_2 . }
}
}
...
The sparql engine tries to satisfy the optional clauses in the whole graph
ignoring the first condition ?id <http://www.w3.org/2002/07/owl#sameAs>
<http://www4.wiwiss.fu-berlin.de/factbook/resource/United_States>
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