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.
- Processing and handling "Big Data" was a very big problem, then Hadoop comes into the picture as a soluntion.
- Apache Hadoop is a framework which provides us various services or tools to store and process Big Data.
- 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?
- Storage unit– HDFS (NameNode, DataNode)
- 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. |