Patrick Huy created UIMA-5909:
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Summary: UIMA-AS: Make Shutdown hooks optional
Key: UIMA-5909
URL: https://issues.apache.org/jira/browse/UIMA-5909
Project: UIMA
Issue Type: Improvement
Components: Async Scaleout
Affects Versions: 2.10.2AS
Reporter: Patrick Huy
In BaseUIMAAsynchronousEngine_impl a shutdown hook gets added to the Runtime
which stops the AsynchronousEngine. This makes it impossible for consumers to
correclty implement a graceful shutdown behaviour on JVM shutdow.
For applications running on Kubernetes the expectation is that on "SIGTERM" the
application completes running requests and then exits. SIGTERM also triggers
JVM shutdown hooks, the AS shutdown hooks prevent running requests from
completing (because the AS Engine is stopped).
It also seems like these hooks are never removed which might lead to issues if
a lot of AS Engines are initialized.
It would be benefitial to make these shutdown hooks optional or remove them
outright.
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