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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