Re: Update LARQ problem

Tue, 11 Oct 2011 02:05:36 -0700 

Le 11/10/11 10:08, Andy Seaborne a écrit :

Jérôme,
Sorry if you've said this before in previous emails but what's the query and what's the data like? When did you last update LARQ? 
Hi Andy,
I did my last LARQ update 2 days ago. The problem is not about datas, because the result is the same with the books.ttl file: 0 result with a very simple query like: 

 PREFIX pf: <http://jena.hpl.hp.com/ARQ/property#>
 SELECT ?doc
 {
   ?lit pf:textMatch 'Potter' .
   ?doc ?p ?lit
 }
I'm trying to find out if something in the chain of packages has changed and whether we've introduced a a regression in ARQ or LARQ.
The only ARQ change I can think of relates to named graphs but you're not using named graphs and the change to correctly handle property functions would only go from 0 to some results.
You have the same data available via <#books> and via <#dataset> -- does the query work one route and not the other or are both now showing 0 results?
No, simple SPARQL queries works fine. I only have problem on the lucene indexed datas with LARQ queries. 

Jérôme


    Andy



On 10/10/11 17:01, Paolo Castagna wrote:

Hi Jérôme,
first of all, thanks for helping out testing the LARQ 0.2.2-incubating-SNAPSHOT 
and for your patience. ;-)
This hopefully will help to spot problems early one and reduce problems once ARQ 
and LARQ are released within Apache.

Jérôme wrote:

Hi,

i've recently made an svn up on my LARQ directory.

Now, my LARQ queries return 0 solution (they returned before).

I'm using:
- fuseki 0.2.1-SNAPSHOT
-arq 2.8.9-SNAPSHOT
-larq 0.2.2-incubating-SNAPSHOT
According to the LARQ's pom.xml file [1], LARQ 0.2.2-incubating-SNAPSHOT now 
depends on the new ARQ SNAPSHOTs.
Precisely, it depends on org.apache.jena:jena-arq:2.8.9-incubating-SNAPSHOT 
Please note the new groupId and artifactId for ARQ.

New ARQ SNAPSHOTs are available here [2].
[1] https://svn.apache.org/repos/asf/incubator/jena/Jena2/LARQ/trunk/pom.xml [2] https://repository.apache.org/content/repositories/snapshots/org/apache/jena/jena-arq/2.8.9-incubating-SNAPSHOT/ 


-lucene 3.1.0

My config.ttl file has not changed:

[...]
<#books>     rdf:type ja:RDFDataset ;
     rdfs:label "Books" ;
     ja:defaultGraph
       [ rdfs:label "discours_de_la_methode.rdf" ;
         a ja:MemoryModel ;
         ja:content [ja:externalContent<file:Data/file.rdf>  ] ;
       ] ;
     .

<#dataset>  rdf:type      tdb:DatasetTDB ;
     tdb:location "/tmp/tdb" ;
     ja:textIndex "/tmp/lucene" ;
     # Query timeout on this dataset (milliseconds)
ja:context [ ja:cxtName "arq:queryTimeout" ; ja:cxtValue "1000" ] ; 
##      tdb:unionDefaultGraph true ;


Before running the fuseki server, i build my triple store with the
command-line:
java -cp target/fuseki-0.2.1-SNAPSHOT-sys.jar tdb.tdbloader
--loc=/tmp/tdb Data/file.rdf


Can you please try:

  - stop Fuseki
  - delete /tmp/lucence
  - restart Fuseki

LARQ will now behave like this:
- if the directory exists with a Lucene index, it will leave it untouched - if the directory does not exists it will create it and index your data 

What do you have in your /tmp/lucene directory?


So, i've no error - juste 0 result...

Any ideas?

Thank you.



Let us know how it goes,
Paolo

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