[
https://issues.apache.org/jira/browse/CLEREZZA-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13704681#comment-13704681
]
Reto Bachmann-Gmür commented on CLEREZZA-745:
---------------------------------------------
another variant:
java.util.ConcurrentModificationException: Reader = 1, Writer = 1
at
com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.policyError(DatasetControlMRSW.java:157)
at
com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.policyError(DatasetControlMRSW.java:152)
at
com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.checkConcurrency(DatasetControlMRSW.java:79)
at
com.hp.hpl.jena.tdb.sys.DatasetControlMRSW.startRead(DatasetControlMRSW.java:46)
at
com.hp.hpl.jena.tdb.nodetable.NodeTupleTableConcrete.startRead(NodeTupleTableConcrete.java:68)
at
com.hp.hpl.jena.tdb.nodetable.NodeTupleTableConcrete.findAsNodeIds(NodeTupleTableConcrete.java:139)
at com.hp.hpl.jena.tdb.store.TripleTable.find(TripleTable.java:76)
at
com.hp.hpl.jena.tdb.store.DatasetGraphTDB.findInDftGraph(DatasetGraphTDB.java:100)
at
com.hp.hpl.jena.sparql.core.DatasetGraphBaseFind.find(DatasetGraphBaseFind.java:46)
at
com.hp.hpl.jena.tdb.store.GraphTDBBase.graphBaseFindDft(GraphTDBBase.java:114)
at
com.hp.hpl.jena.tdb.store.GraphTriplesTDB.graphBaseFind(GraphTriplesTDB.java:71)
at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:268)
at
com.hp.hpl.jena.graph.impl.GraphBase.graphBaseFind(GraphBase.java:290)
at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:287)
at
org.apache.clerezza.rdf.jena.storage.JenaGraphAdaptor.performFilter(JenaGraphAdaptor.java:94)
at
org.apache.clerezza.rdf.core.impl.AbstractTripleCollection.filter(AbstractTripleCollection.java:71)
at
org.apache.clerezza.rdf.core.impl.AbstractTripleCollection.contains(AbstractTripleCollection.java:65)
at
org.apache.clerezza.rdf.core.impl.util.PrivilegedTripleCollectionWrapper$4.run(PrivilegedTripleCollectionWrapper.java:88)
at
org.apache.clerezza.rdf.core.impl.util.PrivilegedTripleCollectionWrapper$4.run(PrivilegedTripleCollectionWrapper.java:84)
at java.security.AccessController.doPrivileged(Native Method)
at
org.apache.clerezza.rdf.core.impl.util.PrivilegedTripleCollectionWrapper.contains(PrivilegedTripleCollectionWrapper.java:84)
at
org.apache.clerezza.rdf.core.access.LockableMGraphWrapper.contains(LockableMGraphWrapper.java:118)
at
org.apache.clerezza.rdf.jena.tdb.storage.MultiThreadedTest.perform(MultiThreadedTest.java:131)
> ConcurrentModicationException on TDB storage provider (SingleDataset)
> ---------------------------------------------------------------------
>
> Key: CLEREZZA-745
> URL: https://issues.apache.org/jira/browse/CLEREZZA-745
> Project: Clerezza
> Issue Type: Bug
> Reporter: Rupert Westenthaler
>
> As reported by Minto van der Sluis in [1] the SingleDataset Jena TDB
> TcProvider can throw .ConcurrentModificationException when iterating over a
> read protected MGraph and a modification is done to an other graph managed in
> the same Jena TDB Dataset. This includes creating a new graph in the dataset.
> Based on a first analysis this is caused by the Single Dataset Jena TDB
> TcProvider using per TripleCollections ReadWrite Locks instead of a single
> ReadWrite Lock for all graphs managed by the same Jena TDB Dataset.
> [1]
> http://mail-archives.apache.org/mod_mbox/clerezza-dev/201303.mbox/%3C5140A9CD.1010208%40xup.nl%3E
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