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Re: [Bigdata-developers] NullPointerException for long property paths
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From: Stefan B. <ste...@wu...> - 2015-09-17 09:03:15
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Hi Bryan, thanks! Is there some kind of developer/beta version I could use once you have a fix? Cheers, Stefan Am 15.09.2015 um 23:27 schrieb Bryan Thompson: > Stefan, > > Thanks for reporting this issue. We were able to replicate the > problem and have found some additional cases where there are issues: > > - https://jira.blazegraph.com/browse/BLZG-1493 (same NPE) > - https://jira.blazegraph.com/browse/BLZG-1495 (wrong answer) > > We will look into these. The 1.5.3 release is being locked down right > now, so the fix will not be in 1.5.3. However, we can reach out once > we do have a fix and see if you can validate it on your setup. Feel > free to subscribe to the tickets for updates. > > Thanks, > Bryan > > > ---- > Bryan Thompson > Chief Scientist & Founder > SYSTAP, LLC > 4501 Tower Road > Greensboro, NC 27410 > br...@sy... <mailto:br...@sy...> > http://blazegraph.com > http://blog.bigdata.com <http://bigdata.com> > http://mapgraph.io > > Blazegraph™ <http://www.blazegraph.com/> is our ultra high-performance > graph database that supports both RDF/SPARQL and Tinkerpop/Blueprints > APIs. Blazegraph is now available with GPU acceleration using our > disruptive technology to accelerate data-parallel graph analytics and > graph query. > > CONFIDENTIALITY NOTICE: This email and its contents and attachments > are for the sole use of the intended recipient(s) and are confidential > or proprietary to SYSTAP. Any unauthorized review, use, disclosure, > dissemination or copying of this email or its contents or attachments > is prohibited. If you have received this communication in error, > please notify the sender by reply email and permanently delete all > copies of the email and its contents and attachments. > > > On Mon, Sep 14, 2015 at 4:26 AM, Stefan Bischof > <ste...@wu... <mailto:ste...@wu...>> wrote: > > Hi all! > > Only last week I started using Blazegraph and was impressed by the > performance and support for property path queries. Currently we are > evaluating different SPARQL engines and especially exploiting property > path queries for a kind of backward-chaining reasoning (see [1] > for more > details). The queries contain very long and complicated property > paths. > > When evaluating these queries (example query and full stack trace > in the > end of the message) I get a NullPointerException. The data I > loaded with > the DataLoader is just the LUBM ontology and just > University0_0.owl from > LUBM. The query (generated by a query rewriter [2]) returns all > instances of lubm:Student under OWL QL semantics and thus encodes all > necessary reasoning in the path expressions. > > Can you see what the actual problem with this query is? > Is the query just too big, too many joins? > What can I do fix this? > > Thank you very much! > Stefan Bischof > > [1] S Bischof, M Krötzsch, A Polleres, S Rudolph: Schema-agnostic > query > rewriting in SPARQL 1.1. ISWC 2014 > [2] http://citydata.wu.ac.at/SPR/ > > Query: > > PREFIX dc: <http://purl.org/dc/elements/1.1/> > PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> > PREFIX foaf: <http://xmlns.com/foaf/0.1/> > PREFIX owl: <http://www.w3.org/2002/07/owl#> > PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> > PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> > PREFIX lubm: <http://swat.cse.lehigh.edu/onto/univ-bench.owl#> > > SELECT * > WHERE > { { ?_v0 > (((((rdfs:subClassOf|owl:equivalentClass)|^owl:equivalentClass)|((owl:intersectionOf/(rdf:rest)*)/rdf:first))|((owl:onProperty/((((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty)|(((owl:inverseOf|^owl:inverseOf)/(((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty))*)/(owl:inverseOf|^owl:inverseOf))))*)/(^owl:onProperty|rdfs:domain)))|((((owl:onProperty/((((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty)|(((owl:inverseOf|^owl:inverseOf)/(((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty))*)/(owl:inverseOf|^owl:inverseOf))))*)/(owl:inverseOf|^owl:inverseOf))/(((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty))*)/rdfs:range))* > lubm:Student . > { { ?p rdf:type ?_v0} > UNION > { ?_v1 > ((((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty)|(((owl:inverseOf|^owl:inverseOf)/(((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty))*)/(owl:inverseOf|^owl:inverseOf))))*/(^owl:onProperty|rdfs:domain) > ?_v0 . > ?p ?_v1 _:b0 > } > } > UNION > { ?_v1 > ((((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty)|(((owl:inverseOf|^owl:inverseOf)/(((rdfs:subPropertyOf|owl:equivalentProperty)|^owl:equivalentProperty))*)/(owl:inverseOf|^owl:inverseOf))))*/rdfs:range > ?_v0 . > _:b1 ?_v1 ?p > } > } > } > > > > > Full Stacktrace: > > java.util.concurrent.ExecutionException: > java.util.concurrent.ExecutionException: > org.openrdf.query.QueryEvaluationException: > java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > java.util.concurrent.FutureTask.report(FutureTask.java:122) > at java.util.concurrent.FutureTask.get(FutureTask.java:188) > at > com.bigdata.rdf.sail.webapp.BigdataServlet.submitApiTask(BigdataServlet.java:281) > at > com.bigdata.rdf.sail.webapp.QueryServlet.doSparqlQuery(QueryServlet.java:632) > at > com.bigdata.rdf.sail.webapp.QueryServlet.doPost(QueryServlet.java:259) > at > com.bigdata.rdf.sail.webapp.RESTServlet.doPost(RESTServlet.java:248) > at > com.bigdata.rdf.sail.webapp.MultiTenancyServlet.doPost(MultiTenancyServlet.java:138) > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:707) > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:790) > at > org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769) > at > org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) > at > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) > at > org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) > at > org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) > at > org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125) > at > org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) > at > org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) > at > org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059) > at > org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) > at > org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) > at > org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) > at > org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) > at org.eclipse.jetty.server.Server.handle(Server.java:497) > at > org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) > at > org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248) > at > org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540) > at > org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610) > at > org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:539) > at java.lang.Thread.run(Thread.java:745) > Caused by: java.util.concurrent.ExecutionException: > org.openrdf.query.QueryEvaluationException: > java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > java.util.concurrent.FutureTask.report(FutureTask.java:122) > at java.util.concurrent.FutureTask.get(FutureTask.java:188) > at > com.bigdata.rdf.sail.webapp.QueryServlet$SparqlQueryTask.call(QueryServlet.java:830) > at > com.bigdata.rdf.sail.webapp.QueryServlet$SparqlQueryTask.call(QueryServlet.java:649) > at > com.bigdata.rdf.task.ApiTaskForIndexManager.call(ApiTaskForIndexManager.java:68) > at java.util.concurrent.FutureTask.run(FutureTask.java:262) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > ... 1 more > Caused by: org.openrdf.query.QueryEvaluationException: > java.lang.RuntimeException: java.util.concurrent.ExecutionException: > java.lang.RuntimeException: java.util.concurrent.ExecutionException: > java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:188) > at > info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68) > at > org.openrdf.query.QueryResults.report(QueryResults.java:155) > at > org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:76) > at > com.bigdata.rdf.sail.webapp.BigdataRDFContext$TupleQueryTask.doQuery(BigdataRDFContext.java:1705) > at > com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.innerCall(BigdataRDFContext.java:1562) > at > com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:1527) > at > com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:699) > ... 4 more > Caused by: java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator.checkFuture(BlockingBuffer.java:1523) > at > com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator._hasNext(BlockingBuffer.java:1710) > at > com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator.hasNext(BlockingBuffer.java:1563) > at > com.bigdata.striterator.AbstractChunkedResolverator._hasNext(AbstractChunkedResolverator.java:365) > at > com.bigdata.striterator.AbstractChunkedResolverator.hasNext(AbstractChunkedResolverator.java:341) > at > com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:134) > ... 11 more > Caused by: java.util.concurrent.ExecutionException: > java.lang.RuntimeException: java.util.concurrent.ExecutionException: > java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > java.util.concurrent.FutureTask.report(FutureTask.java:122) > at java.util.concurrent.FutureTask.get(FutureTask.java:188) > at > com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator.checkFuture(BlockingBuffer.java:1454) > ... 16 more > Caused by: java.lang.RuntimeException: > java.util.concurrent.ExecutionException: java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.rdf.sail.RunningQueryCloseableIterator.checkFuture(RunningQueryCloseableIterator.java:59) > at > com.bigdata.rdf.sail.RunningQueryCloseableIterator.close(RunningQueryCloseableIterator.java:73) > at > com.bigdata.rdf.sail.RunningQueryCloseableIterator.hasNext(RunningQueryCloseableIterator.java:82) > at > com.bigdata.striterator.ChunkedWrappedIterator.hasNext(ChunkedWrappedIterator.java:197) > at > com.bigdata.striterator.AbstractChunkedResolverator$ChunkConsumerTask.call(AbstractChunkedResolverator.java:222) > at > com.bigdata.striterator.AbstractChunkedResolverator$ChunkConsumerTask.call(AbstractChunkedResolverator.java:197) > ... 4 more > Caused by: java.util.concurrent.ExecutionException: > java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.util.concurrent.Haltable.get(Haltable.java:273) > at > com.bigdata.bop.engine.AbstractRunningQuery.get(AbstractRunningQuery.java:1511) > at > com.bigdata.bop.engine.AbstractRunningQuery.get(AbstractRunningQuery.java:104) > at > com.bigdata.rdf.sail.RunningQueryCloseableIterator.checkFuture(RunningQueryCloseableIterator.java:46) > ... 9 more > Caused by: java.lang.Exception: > task=ChunkTask{query=12f11bc0-b22a-48c8-89f7-a3603bae639a,bopId=58,partitionId=-1,sinkId=75,altSinkId=null}, > cause=java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.bop.engine.ChunkedRunningQuery$ChunkTask.call(ChunkedRunningQuery.java:1337) > at > com.bigdata.bop.engine.ChunkedRunningQuery$ChunkTaskWrapper.run(ChunkedRunningQuery.java:896) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) > at java.util.concurrent.FutureTask.run(FutureTask.java:262) > at > com.bigdata.concurrent.FutureTaskMon.run(FutureTaskMon.java:63) > at > com.bigdata.bop.engine.ChunkedRunningQuery$ChunkFutureTask.run(ChunkedRunningQuery.java:791) > ... 3 more > Caused by: java.util.concurrent.ExecutionException: > java.lang.RuntimeException: cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > java.util.concurrent.FutureTask.report(FutureTask.java:122) > at java.util.concurrent.FutureTask.get(FutureTask.java:188) > at > com.bigdata.bop.engine.ChunkedRunningQuery$ChunkTask.call(ChunkedRunningQuery.java:1317) > ... 8 more > Caused by: java.lang.RuntimeException: > cause=java.lang.NullPointerException, > state=JVMHashJoinUtility{open=false,joinType=Normal,joinVars=[],outputDistinctJVs=true,size=20,considered(left=26,right=312,joins=312)} > at > com.bigdata.bop.join.JVMHashJoinUtility.launderThrowable(JVMHashJoinUtility.java:1406) > at > com.bigdata.bop.join.JVMHashJoinUtility.acceptSolutions(JVMHashJoinUtility.java:431) > at > com.bigdata.bop.join.HashIndexOp$ChunkTask.acceptSolutions(HashIndexOp.java:433) > at > com.bigdata.bop.join.HashIndexOp$ChunkTask.call(HashIndexOp.java:338) > at > com.bigdata.bop.join.HashIndexOp$ChunkTask.call(HashIndexOp.java:237) > at java.util.concurrent.FutureTask.run(FutureTask.java:262) > at > com.bigdata.bop.engine.ChunkedRunningQuery$ChunkTask.call(ChunkedRunningQuery.java:1316) > ... 8 more > Caused by: java.lang.NullPointerException > at > com.bigdata.bop.join.JVMHashJoinUtility.acceptSolutions(JVMHashJoinUtility.java:410) > ... 13 more > > > > > ------------------------------------------------------------------------------ > 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