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From "Peter Parente (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-2392) UIMA-AS CAS multiplier hangs fetching empty CAS after client timeouts
Date Wed, 02 May 2012 12:16:53 GMT
Peter Parente created UIMA-2392:

             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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