[UIMA-3638] Remove potential sync bottleneck in RsFullFeatNames and RsLang and MetaDataObject_impl

• 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: 19/Feb/14 19:26
• Updated: 18/Mar/14 20:41
• Resolved: 18/Mar/14 20:41

Description

In large UIMA deployments with multiple threads, some synchronization contention is detected in RsFullFeatNames and RsLang, and the caching that occurs with MetaDataObject_impl. Replace with concurrentHashMap, and for RsFullFeatNames - discard the weakpointers to keys, which is not much of a hazard - because the tables are relatively small vs other memory uses.