If you startup one of our practice exams and the cluster services are not running, here are some things to try first: 1. Run the start_all_services.sh script. You can watch the progress of this script in Ambari - it uses the Ambari REST API to start all HDP services. 2. Login to Ambari and try to start services that way 3. Restart the ambari-agent process on each node in the cluster (password for root is hadoop), then run start_all_services.sh again: ssh root@namenode "ambari-agent restart" ssh root@resourcemanager "ambari-agent restart" # This only applies the HDPCA exam ssh root@hiveserver "ambari-agent restart" # This only applies to the HDPCA exam If none of the steps above fix the issue, then it is likely an issue with the Docker containers not starting properly. Since you do not have root access on your practice exam, the quickest solution is to simply terminate your EC2 instance and startup another one. -Rich ... View more

Hi Vidya, It is really not a big enough instance. The exam uses c3.4xlarge, which is overkill. You should get decent performance somewhere in the middle - maybe try a c3.2xlarge. -Rich ... View more

Hi Daniel, There are no WebHDFS questions on the exam. The exam objectives are listed here: http://hortonworks.com/training/class/hdp-certified-developer-hdpcd-exam/ Have you tried the practice exam? It contains tasks similar to the real exam, and more importantly you get to see what the exam environment is like: http://hortonworks.com/wp-content/uploads/2015/02/HDPCD-PracticeExamGuide1.pdf Thanks, Rich Raposa Certification Manager ... View more

OK - I think I answered my own question: sorry for the confusion. Ambari 2.2.x appears to be smarter than its predecessors. The reason my initial REST request "failed" was because HDFS was already running, so Ambari simply ignored the request. REST API requests used to always show up in the "Background Operations" window, but now they do not if the service doesn't need starting. That decision seems fine with me - just caught me off guard! Thanks for providing feedback. -Rich ... View more