Modify UIMA-AS Aggregate to Handle Cas Not Found Error
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Key: UIMA-1255
URL: https://issues.apache.org/jira/browse/UIMA-1255
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Catch Cas Not Found exception in the finalStep(), log it and return. This
exception can occur when one thread is processing a child of an input CAS in
parallel with another thread processing a second child of the same CAS. The
first thread may remove the input CAS before the second thread completes.
When this happens, the second thread eventually will try to fetch the input CAS
but by that time the CAS no longer exists. An exception is thrown and send
through the error handler which reports it to a client. This exception should
be handled by the aggregate and not sent to the client.
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