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https://issues.apache.org/jira/browse/JENA-1619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andy Seaborne resolved JENA-1619.
---------------------------------
Resolution: Fixed
Assignee: Andy Seaborne
Fix Version/s: Jena 3.10.0
> TransactionException for large query results
> --------------------------------------------
>
> Key: JENA-1619
> URL: https://issues.apache.org/jira/browse/JENA-1619
> Project: Apache Jena
> Issue Type: Bug
> Components: TDB2
> Affects Versions: Jena 3.9.0
> Environment: MacOS 10.14
> Java 1.8.0_161 (Oracle)
> Reporter: Damien Obrist
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.10.0
>
> Attachments: jena-transaction-exception-master.zip
>
>
> When querying a TDB2 dataset, I'm observing a suspicious
> {{TransactionException}}, even though the query results have been copied so
> they can be used outside of a transaction. The exception only seems to occur
> when there are many results.
> h3. Reproduction steps
> * Sample dataset containing 1'000'000 triples
> * Query all triples:
> {code:java}
> SELECT * WHERE { ?s ?p ?o . }{code}
> * Copy query results for use outside of transaction:
> {code:java}
> ResultSetFactory.copyResults(queryExecution.execSelect());{code}
> * Get any variable of the first result
> All variables are {{null}} and the log shows the following exception:
> {noformat}
> org.apache.jena.dboe.transaction.txn.TransactionException: Not in a
> transaction
> at
> org.apache.jena.dboe.transaction.txn.TransactionalComponentLifecycle.checkTxn(TransactionalComponentLifecycle.java:417)
> at
> org.apache.jena.dboe.trans.data.TransBinaryDataFile.read(TransBinaryDataFile.java:182)
> at
> org.apache.jena.tdb2.store.nodetable.TReadAppendFileTransport.read(TReadAppendFileTransport.java:71)
> at org.apache.thrift.transport.TTransport.readAll(TTransport.java:86)
> at
> org.apache.thrift.protocol.TCompactProtocol.readByte(TCompactProtocol.java:637)
> at
> org.apache.thrift.protocol.TCompactProtocol.readFieldBegin(TCompactProtocol.java:543)
> at org.apache.thrift.TUnion$TUnionStandardScheme.read(TUnion.java:222)
> at org.apache.thrift.TUnion$TUnionStandardScheme.read(TUnion.java:213)
> at org.apache.thrift.TUnion.read(TUnion.java:138)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableTRDF.readNodeFromTable(NodeTableTRDF.java:80)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableNative._retrieveNodeByNodeId(NodeTableNative.java:103)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableNative.getNodeForNodeId(NodeTableNative.java:52)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableCache._retrieveNodeByNodeId(NodeTableCache.java:197)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableCache.getNodeForNodeId(NodeTableCache.java:108)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableWrapper.getNodeForNodeId(NodeTableWrapper.java:52)
> at
> org.apache.jena.tdb2.store.nodetable.NodeTableInline.getNodeForNodeId(NodeTableInline.java:66)
> at org.apache.jena.tdb2.solver.BindingTDB.get1(BindingTDB.java:126)
> at
> org.apache.jena.sparql.engine.binding.BindingBase.get(BindingBase.java:104)
> at org.apache.jena.sparql.core.ResultBinding._get(ResultBinding.java:57)
> at
> org.apache.jena.sparql.core.QuerySolutionBase.get(QuerySolutionBase.java:33)
> at TransactionException.main(TransactionException.java:27)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:282)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
> I have created a minimal example available on
> [GitHub|https://github.com/dobrist/jena-transaction-exception] and attached
> to this issue.
> h3. Findings
> * The exception doesn't occur for smaller query results
> * This seems to be a regression as it works as expected with Jena 3.8.0
> * Using {{git bisect}} I have identified the commit where this starts to
> happen:
> [9a60253|https://github.com/apache/jena/commit/9a60253c00aec6763adbb0253588fe4dc0b484d4]
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