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https://issues.apache.org/jira/browse/UIMA-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762270#action_12762270
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Jerry Cwiklik commented on UIMA-1593:
-------------------------------------
Fixed UIMA AS Primitive controller to check if multiple instances of AE are
allowed. The code throws ResourceInitializationException if the AE descriptor's
operational properties are configured to prevent scale-out but the deployment
descriptor scaleout parameter is > 1.
> AEs that declare multipleDeploymentAllowed=false can't be deployed as
> services and called from multiple clients in the same JVM
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: UIMA-1593
> URL: https://issues.apache.org/jira/browse/UIMA-1593
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout, Core Java Framework
> Affects Versions: 2.2.2
> Reporter: Adam Lally
>
> If an AnalysisEngine descriptor declares multipleDeploymentAllowed=false, the
> intention is that there cannot be multiple instances of it in the same JVM.
> UIMA reports an error if you try to embed such an AE in an aggregate that
> declares multipleDeploymentAllowed=true. But this only makes sense for
> co-located components, not services.
> Currently, the service wrapper returns the multipleDeploymentAllowed=false as
> part of the getMetaData() call. The aggregate AE checks this metadata for
> consistency, and at that point it isn't aware that it came from a service, so
> the exception is thrown.
> Perhaps the service wrapper should be modified to set
> mutlipleDeploymentAllowed to true when responding to all getMetaData() calls?
> Alternatively it could be done on the client side, but to me it makes more
> sense for the service to do it - why expose this setting if clients have no
> use for it?
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