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https://issues.apache.org/jira/browse/UIMA-5058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15429446#comment-15429446
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Marshall Schor commented on UIMA-5058:
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Is this still being worked on? perhaps for a more performant fix?
> Scaled out pipelines can falsely trigger the error: Illegal adding of
> additional MetaData after CASes have been defined
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: UIMA-5058
> URL: https://issues.apache.org/jira/browse/UIMA-5058
> Project: UIMA
> Issue Type: Bug
> Components: Core Java Framework
> Affects Versions: 2.8.1SDK
> Reporter: Burn Lewis
> Assignee: Burn Lewis
> Fix For: 2.9.0SDK
>
>
> When UIMA-AS scales out a synchronous UIMA pipeline it sequentially creates
> separate AEs in separate threads, sharing the resource manager. Creation of
> the 2nd (identical) AE will fail with "Illegal adding of additional MetaData
> after CASes have been defined" if a descriptor imports 2 type-system files,
> one of which is included in the other. The check fails to recognize that the
> types loaded by the 2nd AE are already in the resource manager because of the
> way type-systems are cached.
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