[UIMA-5058] Scaled out pipelines can falsely trigger the error: Illegal adding of additional MetaData after CASes have been defined

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.1SDK
• Fix Version/s: 2.9.0SDK, 3.0.0SDK-alpha02
• Component/s: Core Java Framework
• Assignee: Marshall Schor
• Reporter: Burn L. Lewis
• Created: 16/Aug/16 21:04
• Updated: 08/Nov/21 08:45
• Resolved: 13/Feb/17 15:28

Description

When UIMA-AS scales out a synchronous UIMA pipeline it sequentially creates separate AEs in separate threads, sharing the resource manager. Creation of the 2nd (identical) AE will fail with "Illegal adding of additional MetaData after CASes have been defined" if a descriptor imports 2 type-system files, one of which is included in the other. The check fails to recognize that the types loaded by the 2nd AE are already in the resource manager because of the way type-systems are cached.