marco polo created MINIFI-234:
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             Summary: Flow Controller getFlowController singleton pattern isn't 
thread safe
                 Key: MINIFI-234
                 URL: https://issues.apache.org/jira/browse/MINIFI-234
             Project: Apache NiFi MiNiFi
          Issue Type: Bug
          Components: C++
            Reporter: marco polo
            Priority: Critical


This was exposed in testing. When I moved code to FlowControllerFactory I 
noticed that there was no synchronization to prevent issues. The typical setup 
doesn't necessarily cause this but if exposed as an API or in testing, this 
will cause major issues. Testing demonstrates this problem with concurrent 
tests run by CATCH



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