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From "Jim Challenger (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-4252) DUCC: SM Calculeates negative number of service instances to add!
Date Tue, 17 Feb 2015 19:07:12 GMT
Jim Challenger created UIMA-4252:
------------------------------------

             Summary: DUCC: SM Calculeates negative number of service instances to add!
                 Key: UIMA-4252
                 URL: https://issues.apache.org/jira/browse/UIMA-4252
             Project: UIMA
          Issue Type: Bug
          Components: DUCC
    Affects Versions: 1.1.0-Ducc
            Reporter: Jim Challenger
            Assignee: Jim Challenger
             Fix For: 2.0.0-Ducc


If a service is stopped and then started IMMEDIATELY, there will be instances still alive
that are marked to stop because stopping (and starting) is somewhat time consuming.  If this
happens, the PingDriver is doing Bad Math and mis-computing the number of actual instances
alive, resulting in a negative number.  This has the ultimate effect of spawing double (or
maybe more) instances.

Fix is to take Math.max(0, instances) in the PingDriver.



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