Yes, it is probable that the queried data has been modified because it's a production server and the TDB is always used. The way the data are updated in the TDB is using the Jenabean library (1.0.6) which is used to persist the corresponding Java object model.
On 19 January 2016 at 17:58, A. Soroka <aj...@virginia.edu> wrote: > I don’t have the knowledge to unwrap that trace (the real experts here can > do that) but I’d like to ask: if you haven’t changed any part of the > executing code, did you change the data over which you’re running the > queries at the time the problem appeared, and if so, in what way? > > --- > A. Soroka > The University of Virginia Library > > > On Jan 19, 2016, at 11:54 AM, Laurent Rucquoy < > laurent.rucq...@telemis.com> wrote: > > > > Hello, > > > > We have a production server encountering significant slowness resulting > > from high CPU usage since about two weeks now. > > > > When we ckeck high CPU usage threads dumps we note that calls to Jena are > > always implicated. > > > > The calling code in our application executes a SPARQL query and iterates > on > > query solution. > > The Jena version used is 2.10.1 (with jena-tdb 0.10.1) > > There was recently no change made in our application source code that > could > > explain this issue. > > > > Have you any idea about possible causes ? > > > > Thank you in advance for your support. > > > > Sincerely, > > Laurent. > > > > > > Here is a thread dump as an example: > > > > "RMI TCP Connection(17383)-10.249.203.163" daemon prio=6 > > tid=0x0000000015607800 nid=0x1dd0 waiting for monitor entry > > [0x000000001518d000] > > java.lang.Thread.State: BLOCKED (on object monitor) > > at > com.hp.hpl.jena.tdb.base.block.BlockMgrSync.release(BlockMgrSync.java:76) > > - waiting to lock <0x000000072ab58058> (a > > com.hp.hpl.jena.tdb.base.block.BlockMgrCache) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.transaction.BlockMgrJournal.release(BlockMgrJournal.java:207) > > at > com.hp.hpl.jena.tdb.base.block.BlockMgrWrapper.release(BlockMgrWrapper.java:77) > > at > com.hp.hpl.jena.tdb.base.page.PageBlockMgr.release(PageBlockMgr.java:92) > > at > com.hp.hpl.jena.tdb.base.recordbuffer.RecordRangeIterator.close(RecordRangeIterator.java:151) > > at > com.hp.hpl.jena.tdb.base.recordbuffer.RecordRangeIterator.hasNext(RecordRangeIterator.java:134) > > at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) > > at > com.hp.hpl.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.hasNext(DatasetControlMRSW.java:119) > > at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) > > at org.apache.jena.atlas.iterator.Iter$3.hasNext(Iter.java:179) > > at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:906) > > at > org.apache.jena.atlas.iterator.RepeatApplyIterator.hasNext(RepeatApplyIterator.java:58) > > at > com.hp.hpl.jena.tdb.solver.SolverLib$IterAbortable.hasNext(SolverLib.java:193) > > at > org.apache.jena.atlas.iterator.RepeatApplyIterator.hasNext(RepeatApplyIterator.java:46) > > at > com.hp.hpl.jena.tdb.solver.SolverLib$IterAbortable.hasNext(SolverLib.java:193) > > at org.apache.jena.atlas.iterator.Iter$4.hasNext(Iter.java:293) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIterPlainWrapper.hasNextBinding(QueryIterPlainWrapper.java:54) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIterConvert.hasNextBinding(QueryIterConvert.java:59) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40) > > at > com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112) > > at > com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:75) > > at > com.telemis.core.measure.server.rdf.MeasureRetrieveRdf.getMeasuresFromSeriesIds(MeasureRetrieveRdf.java:138) > > at > com.telemis.core.measure.server.rdf.MeasureRetrieveRdf.getMeasuresFromSeries(MeasureRetrieveRdf.java:183) > > at > telemis.measure.tms.service.MeasureService.getMeasuresFromSeries(MeasureService.java:458) > > at > telemis.measure.tms.service.MeasureService.getMeasuresFromExam(MeasureService.java:436) > > at > telemis.measure.tms.messagehandlers.GetMeasuresFromExamMessageHandler.perform(GetMeasuresFromExamMessageHandler.java:46) > > at > telemis.measure.tms.messagehandlers.GetMeasuresFromExamMessageHandler.perform(GetMeasuresFromExamMessageHandler.java:26) > > at > telemis.service.MessageHandlerManager.execute(MessageHandlerManager.java:50) > > at telemis.service.MomoRMIImpl.executeInternal(MomoRMIImpl.java:522) > > at telemis.service.MomoRMIImpl.execute(MomoRMIImpl.java:367) > > at telemis.service.MomoRMIImpl_Skel.dispatch(Unknown Source) > > at sun.rmi.server.UnicastServerRef.oldDispatch(Unknown Source) > > at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source) > > at sun.rmi.transport.Transport$1.run(Unknown Source) > > at sun.rmi.transport.Transport$1.run(Unknown Source) > > at java.security.AccessController.doPrivileged(Native Method) > > at sun.rmi.transport.Transport.serviceCall(Unknown Source) > > at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source) > > at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown > Source) > > at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown > Source) > > at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) > > at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) > > at java.lang.Thread.run(Unknown Source) > > > > Locked ownable synchronizers: > > - <0x0000000737fcdfe8> (a java.util.concurrent.ThreadPoolExecutor$Worker) > > -- *Découvrez la dimension territoriale de votre PACS/MACS au **Symposium Telemis Jeudi 14 Janvier 2016* <https://drive.google.com/file/d/0B8xEcRPFLfNdSGxWS01zVGFtZW8/view?usp=sharing>* au CNA Paris* *Laurent Rucquoy* R&D Engineer laurent.rucq...@telemis.com Tel: +32 (0) 10 48 00 27 Fax: +32 (0) 10 48 00 20 Telemis Avenue Athéna 2 1348 Louvain-la-Neuve Belgium www.telemis.com *Extending Human Life*
