[jira] Commented: (CLEREZZA-194) Replace the integrated SPARQL engine

["Reto Bachmann-Gmür (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CLEREZZA-194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860886#action_12860886 ] 

Reto Bachmann-Gmür commented on CLEREZZA-194:
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It would be inetersting to have a comparison of the speed for a sparql query directly against TDB and the same query using clerezza.

> Replace the integrated SPARQL engine
> ------------------------------------
>
>                 Key: CLEREZZA-194
>                 URL: https://issues.apache.org/jira/browse/CLEREZZA-194
>             Project: Clerezza
>          Issue Type: Improvement
>            Reporter: Oliver Strässer
>            Priority: Critical
>
> The Scalability of the integrated SPARQL engine isn't very good.  Some test with big graphs demonstrate this problem. 
> A Query over a big Graph (120 MB) needs more than 45 seconds with SPARQL. The same "query" build with graph.filter(triple) calls, needs only 1-2 msec - quite faster. 
> research with Manuel Innerhofer shows, that the problem is the hasnext() method of the SPARQL  resultset.

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