QueryExecution.abort seems to corrupt TxTDB 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
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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