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From "Jim Challenger (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-3244) DUCC SM: race - incoming instance state can override global while service is stopping
Date Tue, 03 Sep 2013 14:56:53 GMT
Jim Challenger created UIMA-3244:
------------------------------------

             Summary: DUCC SM: race - incoming instance state can override global while service
is stopping
                 Key: UIMA-3244
                 URL: https://issues.apache.org/jira/browse/UIMA-3244
             Project: UIMA
          Issue Type: Bug
          Components: DUCC
    Affects Versions: 1.0-Ducc
            Reporter: Jim Challenger
            Assignee: Jim Challenger


If a service is unregistered a stop is issued to all instances and global state is set to
Stopping.  If, at the exact time the stop is being implemented, state from an instance that
hasn't yet been terminated comes in, it can progress state back to Available.  Internal state
gets frotzed so query and attempts to reregister the service fail, but retries to unregister
or stop it fail.  

The solution is to insure that, when stopping, the Cumulative State of the service is never
allowed to progress regardless of the instance state at any moment.

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