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  1. Blazegraph (by SYSTAP)
  2. BLZG-1084

sparql endpoint URI in service description is incorrect


    • Type: Bug
    • Status: Accepted
    • Resolution: Unresolved
    • Affects Version/s: BIGDATA_RELEASE_1_3_2
    • Fix Version/s: None
    • Component/s: NanoSparqlServer
    • Labels:


      <rdf:Description rdf:nodeID="defaultDataset">
      	<rdf:type rdf:resource="http://www.w3.org/ns/sparql-service-description#Dataset"/>
      	<rdf:type rdf:resource="http://rdfs.org/ns/void#Dataset"/>
      	<title xmlns="http://purl.org/dc/terms/">kb</title>
      	<Namespace xmlns="http://www.bigdata.com/rdf#/features/KB/">kb</Namespace>
      	<sparqlEndpoint xmlns="http://rdfs.org/ns/void#" rdf:resource="http://localhost:8080/bigdata/namespace/kb/sparql/kb/sparql"/>
      	<sparqlEndpoint xmlns="http://rdfs.org/ns/void#" rdf:resource="http://localhost:8080/bigdata/LBS/namespace/kb/sparql/kb/sparql"/>
      	<uriRegexPattern xmlns="http://rdfs.org/ns/void#">^.*</uriRegexPattern>
      	<defaultGraph xmlns="http://www.w3.org/ns/sparql-service-description#" rdf:nodeID="defaultGraph"/>

      But the correct URL should be:

      	<sparqlEndpoint xmlns="http://rdfs.org/ns/void#" rdf:resource="http://localhost:8080/bigdata/namespace/kb/sparql/kb/sparql"/>

      Also the generated endpoints are based on the requestURL. This means that they will include the "/namespace" URI component when produced by a SERVICE DESCRIPTION request. We need to look at the invocation contexts and ensure that the resulting URI is a SPARQL end point in all cases (ending in /sparql not /namespace).

      Finally, the /LBS/ endpoints are incorrect. They need to be rewritten to use /LBS/leader/ and /LBS/read/. Those URI path components will correctly locate the leader-based LBS redirect and the load balanced read-only based LBS re-direct.

      A related issue as noted on the list: Are you aware that the service description of a namespace gives this sparql endpoint:

      <sparqlEndpoint rdf:resource="http://localhost:8080/bigdata/namespace/kb/sparql/kb/sparql"/>

      instead of

      <sparqlEndpoint rdf:resource="http://localhost:8080/bigdata/namespace/kb/sparql"/>



          • Assignee:
            michaelschmidt michaelschmidt
            bryanthompson bryanthompson
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