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From "Jerry Cwiklik (JIRA)" <uima-...@incubator.apache.org>
Subject [jira] Created: (UIMA-1743) UIMA AS aggregate may hang when one of its primitive delgates fails during initialization
Date Fri, 19 Feb 2010 19:34:28 GMT
UIMA AS aggregate may hang when one of its primitive delgates fails during initialization
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                 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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