Fix UIMA AS race condition allowing parent CAS to hit the Flow Controller ahead
of its child CASes
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Key: UIMA-2162
URL: https://issues.apache.org/jira/browse/UIMA-2162
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Affects Versions: 2.3.1AS
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.3.2AS
A race condition exists in the UIMA AS Aggregate with a scaled up reply queue.
Multiple, concurrent threads consuming CASes produced by a Cas Multiplier
execute at different speeds (most likely due to different de-serialization
times) allowing for a parent CAS to call Flow Controller's next() method
*before* all of its child CASes obtain their Flow objects. Add necessary
synchronization to orchestrate orderly flow of CASes to make sure that the
parent CAS never reaches the Flow Controller ahead of its children.
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