Jerry Cwiklik created UIMA-3950:
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Summary: UIMA-AS allows multiple calls on defineCasPool() which
results in an exception
Key: UIMA-3950
URL: https://issues.apache.org/jira/browse/UIMA-3950
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Affects Versions: 2.6.0AS
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: 2.6.1AS
The UIMA-AS uses a custom thread pool to enable pinning of threads to specific
AE instances. This is needed to enforce a design where a thread used to
initialize AE instance is also used for calling process() on that instance.
The thread pool is plugged in to the jms listener (for the input queue). The
pool is configured with a fixed number of threads (=scaleout factor).
Due to a bug in the uima-as failover code, a thread (from the pool) was exiting
(due to connectivity problem). The problem was replicated by using a bad broker
URL on the top level service.Since the thread pool was told to maintain a fixed
number of threads, the exit of a thread caused
a new thread creation and subsequent attempt to initialize another AE instance
which then led to a call to defineCasPool() again. The uima core doesnt allow
multiple calls to define cas pool and throws an exception.
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