Hadoop Interview Questions for you

1. What is Big Data?

Any data that cannot be stored into traditional RDBMS is termed as Big Data. As we know most of the data that we use today has been generated in the past 20 years. And this data is mostly unstructured or semi structured in nature. More than the volume of the data – it is the nature of the data that defines whether it is considered as Big Data or not.

2. What do the four V’s of Big Data denote?

The four V’s of Bigdata denote the Fallowing

a) Volume –Scale of data
b) Velocity –Different forms of data
c) Variety –Analysis of streaming data
d) Veracity –Uncertainty of data

3.What is Hadoop ?

When “Big Data” emerged as a problem, Apache Hadoop evolved as a solution to it. Apache Hadoop is a framework which provides us various services or tools to store and process Big Data. It helps in analyzing Big Data and making business decisions out of it, which can’t be done efficiently and effectively using traditional systems.To Know more about hadoop enroll Hadoop Training in Chennai

4.What platform and Java version is required to run Hadoop?

Java 1.6.x or higher version are good for Hadoop, preferably from Sun. Linux and Windows are the supported operating system for Hadoop, but BSD, Mac OS/X and Solaris are more famous to work.

5. What kind of Hardware is best for Hadoop?

Hadoop can run on a dual processor/ dual core machines with 4-8 GB RAM using ECC memory. It depends on the workflow needs.

6 )What are the most commonly used Input Formats in Hadoop ?

· TextInputFormat
· KeyValueInputFormat
· SequenceFileInputFormat

7) ) Which one is default InputFormat in Hadoop ?

A) TextInputFormat

8) What is Hive ?

A) Hive is a data warehouse software which is used for facilitates querying and managing large data sets residing in distributed storage.

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