Brad The stack trace looks like you have configured a dataset with some inference. It is possible that the inference layer is not using transactions on the underlying dataset properly, and/or caching some data that is tied to a specific transaction.
For further help we would likely need to see Fuseki config files, Jena versions and ideally sample queries and data that reproduce this Rob On 09/10/2018, 10:36, "Brad Stallion" <[email protected]> wrote: 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
