On this page [1], there is an Exam Objectives link that describes the objectives very well. Focus your study on the content of the Exam Objectives sheet and the linked web pages. Remember, this certification is based on a one day training (HDP OVERVIEW: APACHE HADOOP ESSENTIALS) that is meant as a general introduction to HDP for decision makers, managers, etc. This gives you an idea of the breadth and depth of the exam. Secondly, become familiar with the requirements for actually taking the exam at https://www.examslocal.com/ See their web site for details. You will need to meet the minimum qualifications for web browser, web cam, web connectivity etc - and you will have to pan the camera around the test room so be prepared for that! Ref: 1 https://hortonworks.com/services/training/certification/hca-certification/
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