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https://issues.apache.org/jira/browse/UIMA-1245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656131#action_12656131
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Burn Lewis commented on UIMA-1245:
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Marshall's generalization to apply process-parent-last to any delegate, not
just the first after a CM, would probably be only useful with a custom Flow
Controller, so perhaps it should be controlled via the FC. If we added a
"wait-for-children" flag to each Step object then when set true the framework
could suspend the flow of any CAS with active children. When all children are
released the controller would process the parent's flow. We're currently doing
this just for the FinalStep but generalizing to any Step would be easy. (The
flag would always be set for FinalStep as all children must complete without
errors before the parent is released.)
We could add a new "wait" choice to the ActionAfterCasMultiplier configuration
parameter in the Fixed & Advanced FCs
> Processing order of parent CAS different on UIMA and UIMA AS
> ------------------------------------------------------------
>
> Key: UIMA-1245
> URL: https://issues.apache.org/jira/browse/UIMA-1245
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Reporter: Eddie Epstein
>
> 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.
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