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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] Created: (UIMA-1786) UIMA AS aggregate CM hangs due to client not sending Free Cas Request
Date Mon, 17 May 2010 17:23:42 GMT
UIMA AS aggregate CM hangs due to client not sending Free Cas Request
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                 Key: UIMA-1786
                 URL: https://issues.apache.org/jira/browse/UIMA-1786
             Project: UIMA
          Issue Type: Bug
          Components: Async Scaleout
    Affects Versions: 2.3AS
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik


The UIMA AS client is not handling expired CASes coming from a Cas Multiplier aggregate.The
scenario leading to a problem is as follows:

The aggregate CM is configured with a single thread in a listener processing Process and CPC
requests. The client is configured to timeout before the service sends a child CAS. The client
is configured with no CPC timeout.

UIMA AS client sends a CAS to an aggregate CasMultiplier which takes a long time to process
(or there is a long GC). Before any child CASes are sent to a client, the client times out
and sends a CPC. A bit later, the aggregate CM sends a child CAS. The client receives the
CAS and finds that its parent CAS has expired. The client logs a message and ignores the CAS.
The client is NOT sending the free Cas request to the aggregate CM, causing the aggregate
to hang waiting for all of its CASes to be processed. Since the Free CAS never comes, the
aggregate internal state is never updated and the thread processing the CPC is stuck (hangs).
Modify UIMA AS client code to *always* send free cas request to a CM service.
 

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