Hadoop Interview Questions: we have listed most important hadoop admin interview questions and answers asked in technical interview.
Q: What is Hadoop?
Hadoop is a distributed computing platform which is written in Java.
  1. Processing and handling "Big Data" was a very big problem, then Hadoop comes into the picture as a soluntion.
  2. Apache Hadoop is a framework which provides us various services or tools to store and process Big Data.
  3. Hadoop helps in analyzing Big Data and making useful business decisions, which can't be done efficiently and effectively using traditional systems.
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Q: What is Hadoop's Components?
  1. Storage unit– HDFS (NameNode, DataNode)
  2. Processing framework– YARN (ResourceManager, NodeManager)
Q: What is Big Data?

Big data is a term that describes the large volume of data – both structured and unstructured

Q: What is the main differences between traditional RDBMS and Hadoop?
# RDBMS Hadoop
1 RDBMS relies on the structured data. Any kind of data can be stored into Hadoop i.e. structured, unstructured or semi-structured.
2 RDBMS is used for OLTP processing. Hadoop is used for analytical and for big data processing.