[jira] Commented: (UIMA-1343) Uima AS aggregate controller should synchronize code that processes CPC replies from delegates

["Eddie Epstein (JIRA)" <ui...@incubator.apache.org>]

    [ https://issues.apache.org/jira/browse/UIMA-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707344#action_12707344 ] 

Eddie Epstein commented on UIMA-1343:
-------------------------------------

bq. The result is an ArithmeticException: /by zero.

The problem caused by calling the same CPC method simultaneously from two different threads is entirely user code dependent. The divide by 0 exception was the error for a particular flow controller.

> Uima AS aggregate controller should synchronize code that processes CPC replies from delegates
> ----------------------------------------------------------------------------------------------
>
>                 Key: UIMA-1343
>                 URL: https://issues.apache.org/jira/browse/UIMA-1343
>             Project: UIMA
>          Issue Type: Bug
>          Components: Async Scaleout
>            Reporter: Jerry Cwiklik
>
> Uima AS aggregate allows concurrent processing of CPC replies from its delegates. This creates a problem when two different threads call collectionProcessComplete() on the Flow Controller at the same time. The result is an ArithmeticException: /by zero. The collectionProcessComplete() call should only be done once. Add synchronization to prevent calling collectionProcessComplete() more than once.

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