1. Knowledge doesn't come the age. So if you cannot clear an interview taken by less experienced associate how can we expect you to clear an interview taken by an experienced professional. 2. As you have added a question "Hadoop Architecture" was asked to you in an interview, if you didn't answer that simple question you don't fit in Big Data World. Moreover architecture of framework is an important aspect to understand the functionality, if you are unaware of those concepts as well then better don't give review about the company.