While running a query on the XML document model the following exception is thrown sometimes.

2009-09-11 08:05:58,334 DEBUG [Worker12_SocketWorker160] org.teiid.QUERY_SERVICE - [Ljava.lang.Object;@1105f32
[MetaMatrixProcessingException]The request 2.4 has been cancelled.
at org.teiid.dqp.internal.process.DQPCore.getRequestWorkItem(DQPCore.java:367)
at org.teiid.dqp.internal.process.DQPCore.closeLobChunkStream(DQPCore.java:330)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.teiid.transport.ServerWorkItem.run(ServerWorkItem.java:100)
at com.metamatrix.common.queue.WorkerPoolFactory$StatsCapturingSharedThreadPoolExecutor$1.run(WorkerPoolFactory.java:211)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)