Hi All,I have a TDB2 KB exposed by Fuseki REST api.Such APIs are invoked by
Python code. Each invocation is performed by an urllib2 get/post
urlopen.Queries and updates works, but sometime I get this error from Fuseki:
"urllib2.HTTPError: HTTP Error 500: Iterator used inside a different
transaction"
Here's the full stacktrace from the logs:
[2018-10-09 10:46:21] Fuseki WARN [51] RC = 500 : Iterator used inside a
different transactionorg.apache.jena.dboe.transaction.txn.TransactionException:
Iterator used inside a different transaction at
org.apache.jena.tdb2.store.IteratorTxnTracker.check(IteratorTxnTracker.java:53)
at
org.apache.jena.tdb2.store.IteratorTxnTracker.hasNext(IteratorTxnTracker.java:41)
at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) at
org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:886) at
org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90)
at org.apache.jena.util.iterator.NiceIterator$1.hasNext(NiceIterator.java:105)
at org.apache.jena.util.iterator.NiceIterator$1.hasNext(NiceIterator.java:105)
at
org.apache.jena.reasoner.rulesys.impl.TopLevelTripleMatchFrame.nextMatch(TopLevelTripleMatchFrame.java:55)
at
org.apache.jena.reasoner.rulesys.impl.LPInterpreter.run(LPInterpreter.java:328)
at
org.apache.jena.reasoner.rulesys.impl.LPInterpreter.next(LPInterpreter.java:190)
at org.apache.jena.reasoner.rulesys.impl.Generator.pump(Generator.java:252) at
org.apache.jena.reasoner.rulesys.impl.Generator.pump(Generator.java:239) at
org.apache.jena.reasoner.rulesys.impl.LPBRuleEngine.pump(LPBRuleEngine.java:359)
at
org.apache.jena.reasoner.rulesys.impl.LPTopGoalIterator.moveForward(LPTopGoalIterator.java:107)
at
org.apache.jena.reasoner.rulesys.impl.LPTopGoalIterator.hasNext(LPTopGoalIterator.java:223)
at
org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90)
at
org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90)
at org.apache.jena.util.iterator.FilterIterator.hasNext(FilterIterator.java:55)
at
org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90)
at org.apache.jena.util.iterator.FilterIterator.hasNext(FilterIterator.java:55)
at
org.apache.jena.sparql.engine.iterator.QueryIterTriplePattern$TripleMapper.hasNextBinding(QueryIterTriplePattern.java:135)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:74)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterBlockTriples.hasNextBinding(QueryIterBlockTriples.java:63)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:39)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:39)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:74)
at
org.apache.jena.sparql.engine.ResultSetCheckCondition.hasNext(ResultSetCheckCondition.java:55)
at
org.apache.jena.sparql.resultset.ResultSetApply.apply(ResultSetApply.java:38)
at
org.apache.jena.riot.resultset.rw.ResultSetWriterJSON.write(ResultSetWriterJSON.java:82)
at
org.apache.jena.riot.resultset.rw.ResultsWriter.write(ResultsWriter.java:127)
at org.apache.jena.riot.resultset.rw.ResultsWriter.write(ResultsWriter.java:97)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.lambda$generalOutput$1(ResponseResultSet.java:209)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.output(ResponseResultSet.java:225)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.generalOutput(ResponseResultSet.java:215)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.doResponseResultSet$(ResponseResultSet.java:176)
at
org.apache.jena.fuseki.servlets.ResponseResultSet.doResponseResultSet(ResponseResultSet.java:85)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.sendResults(SPARQL_Query.java:435)
at org.apache.jena.fuseki.servlets.SPARQL_Query.execute(SPARQL_Query.java:290)
at
org.apache.jena.fuseki.servlets.SPARQL_Query.executeWithParameter(SPARQL_Query.java:242)
at org.apache.jena.fuseki.servlets.SPARQL_Query.perform(SPARQL_Query.java:227)
at
org.apache.jena.fuseki.servlets.ActionService.executeLifecycle(ActionService.java:183)
at
org.apache.jena.fuseki.servlets.ActionService.execCommonWorker(ActionService.java:98)
at org.apache.jena.fuseki.servlets.ActionBase.doCommon(ActionBase.java:74) at
org.apache.jena.fuseki.servlets.FusekiFilter.doFilter(FusekiFilter.java:73) at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
at
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
at
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
at
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
at
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
at
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
at
org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
at
org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
at
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
at
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
at
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642)
at
org.apache.jena.fuseki.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:285)
at
org.apache.jena.fuseki.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:248)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1340)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1242)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at
org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:690)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:503) at
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at
org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at
org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
at
org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:745)[2018-10-09 10:46:21] Fuseki INFO
[51] 500 Iterator used inside a different transaction (17 ms)
It seems like different REST calls try to share some transaction inside
Fuseki.Any idea?Thanks
