[jira] [Created] (JENA-248) Fuseki server unresponsive when running multiple construct queries using multi-threading.

[Rahul Sharma (JIRA)]

Rahul Sharma created JENA-248:
---------------------------------

             Summary: Fuseki server unresponsive  when running multiple 
construct queries using multi-threading.
                 Key: JENA-248
                 URL: https://issues.apache.org/jira/browse/JENA-248
             Project: Apache Jena
          Issue Type: Bug
          Components: Fuseki
    Affects Versions: Fuseki 0.2.1
         Environment: Windows 7 (x64)
            Reporter: Rahul Sharma


Hi Andy,

We are running concurrency tests for Fuseki 0.2.1 (downloaded from 
http://www.apache.org/dist/incubator/jena/jena-fuseki-0.2.1-incubating/).
We're running multiple construct queries (approximately 200 queries) using Task 
Parallel Library of .Net to talk to Fuseki and get response back. We've first 
tried through dotNetRdf and when about 25 queries have run, the fuseki server 
freezes and becomes unresponsive. To make it responsive again, we had to 
restart the fuseki service.
Now the construct query is a bit that stands out here because its querying two 
separate service endpoints. Following is the sample construct query that we're 
using:
CONSTRUCT
{ 
        <http://rahul.org/company/id/123456> ?predicate ?object . 
        ?blankNode ?blankNodePredicate ?blankNodeObject .
        <http://rahul.org/company/id/123456> ?pred ?blankNode1 .
        ?blankNode1 ?blankNodePredicate1 ?blankNodeObject1 .
}
WHERE
{
        SERVICE <http://localhost:3030/companies/sparql>
        {
                <http://rahul.org/company/id/123456> ?predicate ?object .
        }
        SERVICE <http://localhost:3030/rahul/sparql>
        {
                OPTIONAL 
                {
                        <http://rahul.org/company/id/123456> ?pred ?blankNode1 .
                        ?blankNode1 ?blankNodePredicate1 ?blankNodeObject1 .
                }
        }
}

Then we ran the queries again to make sure its not because of dotNetRdf - so 
we've used a simple HttpWebRequest - something like this:
var request = HttpWebRequest.Create("http://localhost:3030/query/sparql?query="; 
+ GetUtf8(sparql)) as HttpWebRequest;
request.Method = "GET";
var response = request.GetResponse();

Could you please help with this problem of Fuseki server becoming unresponsive 
in the above mentioned case.

Thanks,
Rahul


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