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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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