UIMA AS aggregate fetches too many msgs from its service queue
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Key: UIMA-2354
URL: https://issues.apache.org/jira/browse/UIMA-2354
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.4.0AS
In this scenario UIMA AS aggregate thread receives a msg from a service queue,
desarializes a CAS, fetches the next step from the FC, and deliveres the CAS to
a delegate's queue. Once the CAS is delivered to the delegate's queue, the
receiving thread is done and proceeds to fetch another msg from a service
queue. This is wrong and totaly breaks prefetch=0 idea and effects load
balancing if there are multiple instances of UIMA AS aggregate. The receiving
thread should not fetch another msg while the previous CAS is still in-play.
The code should block the receiving thread after a CAS is delivered to a
delegate's queue until the CAS is fully processed.
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