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https://issues.apache.org/jira/browse/UIMA-1199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638917#action_12638917
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Adam Lally commented on UIMA-1199:
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Synchronous UIMA runs them in sequence, and I think it's best to be consistent. 
 A Flow Controller should be able to issue a ParallelStep to indicate that 2 
things may logically be run in parallel, not that they *must* be run in 
parallel.

> If a parallel flow involves colocated delegates the application hangs
> ---------------------------------------------------------------------
>
>                 Key: UIMA-1199
>                 URL: https://issues.apache.org/jira/browse/UIMA-1199
>             Project: UIMA
>          Issue Type: Bug
>          Components: Async Scaleout
>    Affects Versions: 2.2.2
>            Reporter: Burn Lewis
>            Priority: Minor
>         Attachments: UIMA-1199-test.patch, 
> uimaj-as-core-UIMA-1199-patch-01.txt, uimaj-as-core-UIMA-1199-patch-02.txt
>
>
> Parallel flows can only run in parallel when the delegates are remote, but we 
> should handle any colocated ones by running them sequentially in arbitrary 
> order as synchronous UIMA does.  The spec says that the framework is not 
> obliged to run them in parallel.  The alternative of rejecting the flow is 
> undesirable as it can only be detected at run time since the flow controller 
> may be user code.

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