title: Internal 500 Error for controller service : HDF Nifi with 3 Node cluster
body: <p>I have installed HDF 2.1.2 with 3 node Nifi 1.1 cluster and I am trying to configure controller service in it. I created a simple ExecuteHQL processor which depends on ThriftConnectionPool controller service.</p>
  
  <p>I dragged ExecuteProcessor on canvas and as soon as I clicked on gear icon for configuring controller service , it throws runtime exception in log.</p>
  
  <pre><code>Attempting request for (anonymous) GET http://&lt;hostname&gt;:9090/nifi-api/flow/process-groups/83490f62-015c-1000-0000-00004da8f033/controller-
  
  HTTP 500 Internal Server Error
  </code></pre>