Brian Mullen created JENA-1522:
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Summary: Unable to consistently retrieve data from large dataset
Key: JENA-1522
URL: https://issues.apache.org/jira/browse/JENA-1522
Project: Apache Jena
Issue Type: Bug
Components: Fuseki, Jena
Affects Versions: Jena 3.6.0
Environment: System 1: Centos 7, Jena 3.6, Unknown Fuseki version.
System 2: Ubuntu 16.04 running Docker. Running stain/jena-fuseki from the
official Docker Hub.
Reporter: Brian Mullen
In my 500M+ triple dataset, queries seem to be failing for no clear reason.
Here's an example.
{code:java}
prefix Products: <http://www.example.com/test/Products#>
select ?p ?o
where {
Products:ABC ?p ?o .
}
{code}
...results in a list like:
{code:java}
Products:HasComponent Products:DEF
Products:HasComponent Products:GHI {code}
Now running this query:
{code:java}
prefix Products: <http://www.example.com/test/Products#>
select ?p
where {
Products:ABC ?p Products:DEF .
} {code}
...has no results. How is this possible?
Here's another example.
{code:java}
prefix Products: <http://www.example.com/test/Products#>
ask where {
Products:ABC Products:PartNumber ?p .
filter ( ?p = "ABC" )
} {code}
This returns "True"
{code:java}
prefix Products: <http://www.example.com/test/Products#>
ask where {
?s Products:PartNumber ?p .
filter ( ?p = "ABC" )
} {code}
This returns "False"
What other info can I provide?
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