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From "Adam Lally (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Commented: (UIMA-1199) If a parallel flow involves colocated delegates the application hangs
Date Sun, 12 Oct 2008 22:08:44 GMT

    [ https://issues.apache.org/jira/browse/UIMA-1199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638917#action_12638917
] 

Adam Lally commented on UIMA-1199:
----------------------------------

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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