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From Benson Margulies <bimargul...@gmail.com>
Subject Re: ConcurrentModificationException with Fuseki/TDB
Date Tue, 08 Feb 2011 18:35:39 GMT
Paolo,

I think it's a feature. Between 0.8.9 and trunk, TDB got much more
sensitive to modifying anything at all while any iterator was live.


On Tue, Feb 8, 2011 at 1:13 PM, Paolo Castagna
<castagna.lists@googlemail.com> wrote:
> Hi,
> today, I have been playing with the BSBM (i.e. trying to automate as much as
> possible).
> I got a (reasonable?) bash script:
> https://github.com/castagna/bsbm-automated
>
> If I use just one client everything is fine.
>
> However, when I try to run BSBM against Fuseki with more than one client
> (i.e. BSBM uses multiple threads to run queries) I get this exception on the
> Fuseki log:
>
> java.util.ConcurrentModificationException: Reader = 0, Writer = 2
>        at
> com.hp.hpl.jena.tdb.sys.ConcurrencyPolicyMRSW.policyError(ConcurrencyPolicyMRSW.java:127)
>        at
> com.hp.hpl.jena.tdb.sys.ConcurrencyPolicyMRSW.policyError(ConcurrencyPolicyMRSW.java:122)
>        at
> com.hp.hpl.jena.tdb.sys.ConcurrencyPolicyMRSW.checkConcurrency(ConcurrencyPolicyMRSW.java:62)
>        at
> com.hp.hpl.jena.tdb.sys.ConcurrencyPolicyMRSW.startUpdate(ConcurrencyPolicyMRSW.java:46)
>        at
> com.hp.hpl.jena.tdb.nodetable.NodeTupleTableConcrete.startWrite(NodeTupleTableConcrete.java:54)
>        at
> com.hp.hpl.jena.tdb.nodetable.NodeTupleTableConcrete.sync(NodeTupleTableConcrete.java:237)
>        at com.hp.hpl.jena.tdb.store.TripleTable.sync(TripleTable.java:89)
>        at
> com.hp.hpl.jena.tdb.store.DatasetGraphTDB.sync(DatasetGraphTDB.java:262)
>        at com.hp.hpl.jena.sparql.SystemARQ.sync(SystemARQ.java:47)
>        at org.openjena.fuseki.servlets.HttpAction.sync(HttpAction.java:61)
>        at
> org.openjena.fuseki.servlets.HttpAction.endWrite(HttpAction.java:39)
>        at
> org.openjena.fuseki.servlets.SPARQL_Query.execute(SPARQL_Query.java:226)
>        at
> org.openjena.fuseki.servlets.SPARQL_Query.executeForm(SPARQL_Query.java:187)
>        at
> org.openjena.fuseki.servlets.SPARQL_Query.perform(SPARQL_Query.java:87)
>        at
> org.openjena.fuseki.servlets.SPARQL_ServletBase.doCommon(SPARQL_ServletBase.java:76)
>        at
> org.openjena.fuseki.servlets.SPARQL_Query.doGet(SPARQL_Query.java:68)
>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
>        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>        at
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:534)
>        at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:475)
>        at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:224)
>        at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:921)
>        at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:403)
>        at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:184)
>        at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:856)
>        at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
>        at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:114)
>        at org.eclipse.jetty.server.Server.handle(Server.java:352)
>        at
> org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:596)
>        at
> org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:1052)
>        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:590)
>        at
> org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:212)
>        at
> org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:426)
>        at
> org.eclipse.jetty.server.nio.BlockingChannelConnector$BlockingChannelEndPoint.run(BlockingChannelConnector.java:292)
>        at
> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:450)
>        at java.lang.Thread.run(Thread.java:619)
>
> I have been using TDB (from trunk) and Fuseki (from trunk):
>
> Jena:       VERSION: 2.6.4
> Jena:       BUILD_DATE: 2010-12-12T16:56:15+0000
> ARQ:        VERSION: 2.8.8-SNAPSHOT
> ARQ:        BUILD_DATE: 2011-02-04T18:04:22+0000
> TDB:        VERSION: 0.8.10-SNAPSHOT
> TDB:        BUILD_DATE: 2011-02-07T13:25:50+0000
> Fuseki:     VERSION: 0.2.0-SNAPSHOT
> Fuseki:     BUILD_DATE: 2011-02-08T12:43:18+0000
>
> I have tried to do the same with Joseki v3.4.3 (I was not able to check it
> out using CVS as anonymous user, bah...)
>
> I know, I know...
>
> I am just asking, is it a known problem?
>
> Paolo
>

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