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Posted to dev@jena.apache.org by "Paolo Castagna (Updated) (JIRA)" <ji...@apache.org> on 2011/11/17 10:56:52 UTC
[jira] [Updated] (JENA-143) QueryExecution.abort seems to corrupt
TDB when interrupting transactional queries
[ https://issues.apache.org/jira/browse/JENA-143?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Paolo Castagna updated JENA-143:
--------------------------------
Summary: QueryExecution.abort seems to corrupt TDB when interrupting transactional queries (was: QueryExecution.abort seems to corrupt TxTDB when interrupting transactional queries)
> QueryExecution.abort seems to corrupt TDB when interrupting transactional queries
> ---------------------------------------------------------------------------------
>
> Key: JENA-143
> URL: https://issues.apache.org/jira/browse/JENA-143
> Project: Jena
> Issue Type: Bug
> Components: TDB
> Environment: tdb-0.9.0-20111010.121635
> Reporter: Simon Helsen
> Attachments: T_TransSystem_patchedForJena143.txt
>
>
> The interaction between queryExecution.abort() and TxTDB transactions seems to suffer from a problem. When I use it, it seems that the store corrupts again. Note that when the QueryCancellationException is thrown, I actively abort the DatasetGraphTxn object, but I am seeing
> 14:59:20,580 [477961341@qtp-1709008349-8] WARN hpl.jena.sparql.engine.iterator.QueryIteratorCheck - Open iterator: QueryIterFilterExpr/37159
> and then shortly after:
> 15:00:34,691 [jazz.jfs.indexer.jfs_tests_default_consumer_name.triple] ERROR com.ibm.team.jfs - Originating Exception:
> com.hp.hpl.jena.tdb.base.file.FileException: ObjectFile.read(8072)[12980][12980]: Impossibly large object : 1936010863 bytes
> at com.hp.hpl.jena.tdb.base.objectfile.ObjectFileStorage.read(ObjectFileStorage.java:294)
> at com.hp.hpl.jena.tdb.base.objectfile.ObjectFileStorage$ObjectIterator.next(ObjectFileStorage.java:409)
> This is the used coding pattern. The main thread just sets up the transaction, so, something like this:
> DatasetGraphTxn dsGraph = null;
> try {
> dsGraph = StoreConnection.make(this.location).begin(ReadWrite.READ);
> Dataset ds = dsGraph.toDataset();
>
> ...
> QueryExecution qe = null;
> ...
> try {
> results = qe.execSelect();
> ...
> } finally {
> if (qe != null) {
> qe.close();
> }
> }
> } catch (QueryCancelledException e) {
> if (dsGraph != null) {
> dsGraph.abort();
> }
> } finally {
> if (dsGraph != null) {
> dsGraph.close();
> }
> }
> A parallel thread may decide that the given query needs to be cancelled, so it has access to the QueryExecution and may decide to call
> this.queryExecution.abort();
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