[JENA-1121] Performance regression in Jena 3.0.1 / Fuseki 2.3.1

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Abandoned
• Affects Version/s: Jena 3.0.1, Fuseki 2.3.1, Jena 3.1.0, Fuseki 2.4.0
• Component/s: Jena
• Labels: performance

Environment

Mac OS X 10.10.5, iMac, 3.4 GHz Intel Core i7, 32 GB RAM

• Assignee: Unassigned
• Reporter: Benjamin Geer
• Created: 18/Jan/16 17:51
• Updated: 19/Apr/20 16:11
• Resolved: 19/Apr/20 16:11

Description

We seem to have encountered a severe performance regression in Jena 3.0.1 / Fuseki 2.3.1 as compared with Jena 3.0.0 / Fuseki 2.3.0. A number of our queries are running between 2 and 20 times slower. Here's one small example with configuration for Fuseki. With Fuseki 2.3.0, the query below takes about 200 milliseconds. With Fuseki 2.3.1, it takes 9 seconds. I've also tried it with the latest Fuseki snapshot (apache-jena-fuseki-2.4.0-20160117.183513-33.zip), and got the same result as with the 2.3.1 release.

Here's the test data and configuration:

https://www.dropbox.com/s/b9aepexij5e7noj/jena-performance-test.zip?dl=0

Here's the query:

prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
prefix knora-base: <http://www.knora.org/ontology/knora-base#>

SELECT DISTINCT
    ?resourceIri
    ?resourceLabel
    (SAMPLE(?anyMatch) AS ?match)

WHERE {
    BIND(STR("de") AS ?preferredLanguage)
    BIND(STR("en") AS ?fallbackLanguage)

    ?s <http://jena.apache.org/text#query> 'Zeitglöcklein' .

    MINUS {
        ?s knora-base:isDeleted true .
    }

    OPTIONAL {
        ?s a ?valueObjectType .
        ?valueObjectType rdfs:subClassOf+ knora-base:Value .
        ?resIri ?resourceProperty ?s .
        ?s knora-base:valueHasString ?literal .

        OPTIONAL {
            ?resourceProperty rdfs:label ?preferredLanguageResourcePropertyLabel .
            FILTER (LANG(?preferredLanguageResourcePropertyLabel) = ?preferredLanguage) .
        }

        OPTIONAL {
            ?resourceProperty rdfs:label ?fallbackLanguageResourcePropertyLabel .
            FILTER (LANG(?fallbackLanguageResourcePropertyLabel) = ?fallbackLanguage) .
        }

        OPTIONAL {
            ?resourceProperty rdfs:label ?anyLanguageResourcePropertyLabel .
        }

        BIND(COALESCE(str(?preferredLanguageResourcePropertyLabel), str(?fallbackLanguageResourcePropertyLabel), str(?anyLanguageResourcePropertyLabel)) AS ?propertyLabel)

        BIND(CONCAT(STR(?valueObjectType), "|", STR(?propertyLabel), "|", STR(?literal)) AS ?anyMatch)

        MINUS {
            ?resIri knora-base:isDeleted true .
        }
    }

    BIND(COALESCE(?resIri, ?s) AS ?resourceIri)

    ?resourceIri a ?resourceClass .
    ?resourceClass rdfs:subClassOf+ knora-base:Resource .
    ?resourceIri rdfs:label ?resourceLabel .
}

GROUP BY
    ?resourceIri
    ?resourceLabel

ORDER BY ?resourceIri

Best regards,
Benjamin Geer