[UIMA-3798] JCasHashMap race condition hang

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0SDK
• Fix Version/s: 2.6.0SDK
• Component/s: Core Java Framework
• Assignee: Marshall Schor
• Reporter: Marshall Schor
• Created: 02/May/14 17:55
• Updated: 03/May/14 15:25
• Resolved: 03/May/14 15:25

Description

Jerry C discovered a hang failure - I was able to reproduce on a particular large machine. Traced to a race condition - where a "reserve" is found, and then a lock is acquired. There's a chance that between these 2 events, another thread can change the reserve to a real value - if this happens, a hang. Recheck the value after acquiring the lock.