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From Paolo Castagna <castagna.li...@googlemail.com>
Subject ConcurrentModificationException with Fuseki/TDB
Date Tue, 08 Feb 2011 18:13:37 GMT
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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