[UIMA-3674] Allow multiple iterators in different threads to read the CAS

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.5.0SDK
• Fix Version/s: 2.6.0SDK
• Component/s: Core Java Framework
• Assignee: Marshall Schor
• Reporter: Marshall Schor
• Created: 13/Mar/14 18:08
• Updated: 18/Mar/14 20:37
• Resolved: 18/Mar/14 20:37

Description

Some applications scale out on multi-core machines by using CAS Multipliers. Sometimes, it makes sense when the new CASes have a lot of identical data, to have the common part of these in another CAS which can be set up and shared (read-only) by other threads. Unfortunately, this design suffers from random failures in the CAS iterator code. Figure out what's wrong and fix this, to start supporting read-only CASes being accessed simultaneously in a multi-core platform on multiple threads. Include a JUnit test case, too, if possible.