private int generateRequestId(){
      requestId += 1;
      return requestId % recommendationsArtifactsRolloverMax;

  }
Returns an incremented requestId. Rollsover back to 0 in case the requestId >= recommendationsArtifactsrollovermax
@return {int requestId}
ambari-server/src/main/java/org/apache/ambari/server/api/services/stackadvisor/StackAdvisorHelper.java