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https://issues.apache.org/jira/browse/JENA-248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne updated JENA-248:
-------------------------------
Attachment: JENA-248-materialize-result-bytes.patch
> 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
> Labels: Fuseki, Multi-Threading
> Attachments: JENA-248-materialize-result-bytes.patch
>
>
> 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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