[UIMA-1165] Fix a race condition in the UIMA-AS aggregate that results in a hang

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.3AS
• Component/s: Async Scaleout
• Assignee: Unassigned
• Reporter: Jaroslaw Cwiklik
• Created: 04/Sep/08 15:17
• Updated: 15/Sep/09 16:02
• Resolved: 05/Sep/08 17:16

Description

When running a complex Cas Multiplier Aggregate AS service with a scaled out listener threads, a race condition occurs that leads to a hang. Specifically, one thread obtains a number of child CASes produced from an input CAS, than this thread is preempted and another thread releases one of the child CASes. The parent CAS may not be released from the InProcessCache leading to CAS pool exhaustion since many CASes are stuck in the InProcessCache waiting to be released.