Peter Parente created UIMA-2392:
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Summary: UIMA-AS CAS multiplier hangs fetching empty CAS after
client timeouts
Key: UIMA-2392
URL: https://issues.apache.org/jira/browse/UIMA-2392
Project: UIMA
Issue Type: Bug
Components: Async Scaleout
Affects Versions: 2.3.1AS
Environment: RedHat Enterprise Linux 6.0, Mac OSX Lion 10.7.3
Reporter: Peter Parente
I'm attaching a test case that reproduces the hang. See the README inside the
zip about how to execute it.
The annotator (ForwardJCas) consists of a simple CAS multiplier with delays in
it scaled out in its own thread within 2 levels of aggregates. It receives a
CAS, sleeps for 3 seconds, gets a new empty CAS, copies information into it,
sleeps again, and then returns the CAS. The unit test (UimaAsTest) initializes
40 UIMA-AS clients with a timeout of 8 seconds, send 1 CAS from each to the
service, and then waits. After 1-2 runs, the CAS multiplier winds up hanging on
the getEmptyCas() call in the scaled out annotator.
What appears to be happening is that free CAS messages are not being sent from
the client to the service in all cases when the timeouts occur. A similar
defect (https://issues.apache.org/jira/browse/UIMA-1786) was fixed in 2.3.1
with slightly different symptoms.
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