[UIMA-1245] Processing order of parent CAS different on UIMA and UIMA AS

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.3AS
• Component/s: Async Scaleout
• Assignee: Eddie Epstein
• Reporter: Eddie Epstein
• Created: 03/Dec/08 16:53
• Updated: 15/Sep/09 14:57
• Resolved: 14/Apr/09 16:20

Description

Arron Kaplan raised the question of when parent CASes are processed relative to their children. See http://markmail.org/message/5cop7iv2nshouhgs As of now, the processing order for a multi-threaded UIMA AS aggregate is different than that for a single-threaded UIMA aggregate.

A discussion with Burn, Adam, Jerry, Marshall and myself concluded that the default processing order for UIMA AS should be changed to be the same as in UIMA, in order to have the same application behavior for both. This will be done by suspending flow of a parent CAS after it is returned from a CasMultiplier delegate until all its children CASes have finished processing.

However, there also needs to be a UIMA AS deployment option for CasMultiplier delegates that allows the parent CAS to resume processing immediately after being returned from the CM. This option is needed to enable parallel processing.