Check out Top 5 Interview Questions of Hadoop

The enormous increase in the number of organizations has led to an increase in data, simultaneously and is termed as Big Data. There are numerous ways invented to manage this Big Data and one of them is Hadoop.

Big Data and Hadoop are termed as the fields that are constantly into changing phase and the ones who are working in this domain needs to upgrade their skills every now and then.

Today, we bring some of the commonly asked interview questions that the candidates must be aware of, in order to face the interviews with confidence and get to know about what is trending in the industry.

Top 5 Interview Questions

Q: How can a business increase its revenue using Big Data Analysis?

A: Big Data is helping numerous organizations in varied ways like one of the leading brands Walmart is making use of Big Data Analysis. It helps them to study the trend of product sales among customers and this data is further used for launching new products that are preferred by the customers. There are other companies as well that are making use of it, namely Facebook, LinkedIn, Twitter, etc. that are utilizing the best of Big Data Analysis.

Q: What is the difference between Structured and Unstructured data?

A: The Data that can be stored in the traditional format of rows and tables is termed as the Structured Data. The most relatable example can be the data of purchasing transactions. While, the Unstructured Data comprise of partial saving of the typical database systems, like the XML records are counted amongst semi structured data. The raw data that cannot be categorized anywhere is termed as the unstructured data. These include the Tweets on Twitter, Reviews, or the Facebook updates, to name a few.

Q; What comprises of the inter cluster data copying process?

A: HDFS (Hadoop Distributed File System) avails the facility of a distributed data copy via  DistCP taken from the source to the destination. If the copied data lies in the Hadoop cluster, it is called the inter cluster data copying.


Q:  What is the use of overwrite keyword in the Hive load statement?


A: The content of the target table can be deleted and replaced with the help of overwrite keyword. The files are replaced by the referral file path that are added in the table by using the command.


Q: What is the difference between HBase and Hive?


A: HBase and Hive are named as two different technologies based on Hadoop. The Hive technology is the infrastructure that works on the data warehouse format, while the HBase technology is termed as the NoSQL store that operates on Hadoop. Hive let the tech savvy users, to work on the MapReduce jobs, whereas HBase let the users work on four major operations named as put, get, scan, and delete. HBase is used to query Big Data on a real time basis and the Hive is used to make analytical queries on the data gathered from a specific time period.

Hadoop allows many Big Data users to handle many tough tasks easily and attain the target. There are many other questions as well that can be asked by interviewers in order to test the knowledge of the candidate. To help the aspirants in this context, Multisoft Virtual Academy has organized a free live webinar for the Hadoop candidates on April 17, 2016 at 5-6 PM (IST) wherein the participants can listen to the experts live.

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