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https://issues.apache.org/jira/browse/UIMA-1743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik closed UIMA-1743.
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Resolution: Fixed
Modified initializeAnalysisEngine() to destroy AE and return if a service was
stopped while initializing AE in the core's produceAnalysisEngine() method.
Modified postInitialize() to spin a cleanup thread and mark service as
initialized only if the service is not stopped.
> UIMA AS aggregate may hang when one of its primitive delgates fails during
> initialization
> -----------------------------------------------------------------------------------------
>
> Key: UIMA-1743
> URL: https://issues.apache.org/jira/browse/UIMA-1743
> Project: UIMA
> Issue Type: Bug
> Components: Async Scaleout
> Affects Versions: 2.3AS
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> There is a race condition in UIMA AS that may lead to a hang while trying to
> stop an aggregate service with multiple primitive delegates. If one of the
> delegates fails during initialization and the DD says to terminate, the
> aggregate sends STOP event to each delegate to force clean shutdown. When a
> primitive is instantiating AE via produceAnalysisEngine() call and the STOP
> comes on another thread, the state of the service is changed to stopped. When
> the AE is finally initialized and produceAnalysisEngine() returns, the code
> does not check for service status and proceeds to call postInitialize() which
> spins a cleanup thread and marks the service as initialized successfully.
> There are two problems:
> 1) Primitive service doesnt check if it has been stopped after
> produceAnalysisEngine() returns
> 2) In postInitialize(), the primitive service always starts a cleanup thread
> no matter what the status of the service is. This cleanup thread is never
> stopped and leads to a hang.
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