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https://issues.apache.org/jira/browse/JENA-289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428637#comment-13428637
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Andy Seaborne commented on JENA-289:
------------------------------------
The file TestTimeout does not have the software grant to Apache. Therefore,
while the project can look at it, we can not incorporate it into our test
suite. Would it possible to grant the file? (Ideally, with a copyright
statement in the file as well.)
See for example, PerformanceRegressionTest.java in JENA-256.
> Respect query timeouts in TDB implementation
> --------------------------------------------
>
> Key: JENA-289
> URL: https://issues.apache.org/jira/browse/JENA-289
> Project: Apache Jena
> Issue Type: Improvement
> Components: TDB
> Affects Versions: TDB 0.9.1
> Reporter: Mark Buquor
> Attachments: TestTimeout.java
>
>
> In general use, we sometimes see queries throw QueryCancelledException
> several seconds/minutes after the expected timeout. This is acceptable to a
> degree, but it appears that there are cases where a rogue query could execute
> unmitigated. The attached testcase is an example of a query that will execute
> and consume CPU/heap until an OutOfMemoryError is thrown.
> Example: The following query with 10s timeouts executed for ~7 minutes before
> throwing an OOME.
> Aug 3, 2012 10:18:19 AM Executing query [limit=1,000 timeout1=10s
> timeout2=10s]: SELECT * WHERE { ?a ?b ?c . ?c ?d ?e }
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> at java.util.HashSet.<init>(HashSet.java:86)
> at org.openjena.atlas.iterator.FilterUnique.<init>(FilterUnique.java:26)
> at org.openjena.atlas.iterator.Iter.distinct(Iter.java:438)
> at
> com.hp.hpl.jena.tdb.solver.StageMatchTuple.makeNextStage(StageMatchTuple.java:116)
> at
> com.hp.hpl.jena.tdb.solver.StageMatchTuple.makeNextStage(StageMatchTuple.java:44)
> at
> org.openjena.atlas.iterator.RepeatApplyIterator.hasNext(RepeatApplyIterator.java:49)
> at org.openjena.atlas.iterator.Iter$4.hasNext(Iter.java:295)
> 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:108)
> at
> com.hp.hpl.jena.sparql.engine.iterator.QueryIterSlice.hasNextBinding(QueryIterSlice.java:76)
> at
> com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:108)
> 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:108)
> 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:108)
> 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:108)
> at
> com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:72)
> at
> com.hp.hpl.jena.sparql.resultset.ResultSetApply.apply(ResultSetApply.java:41)
> at com.hp.hpl.jena.sparql.resultset.XMLOutput.format(XMLOutput.java:52)
> at
> com.hp.hpl.jena.query.ResultSetFormatter.outputAsXML(ResultSetFormatter.java:482)
> at
> com.hp.hpl.jena.query.ResultSetFormatter.outputAsXML(ResultSetFormatter.java:460)
> at TestTimout.main(TestTimout.java:84)
> Aug 3, 2012 10:25:41 AM Finished
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