Big Data Interview Questions and Answers

Big data analytics is a comparatively new technology helping organizations to harness their own data and optimize its use for identifying new opportunities. Here are some of the ways Big Data is vital to organizations:

• Cost reduction: It uses technologies like cloud-based analytics and Hadoop which effectively bring down costs a lot, especially when storing large amounts of data. In addition to that, analytics helps identify multiple efficient ways to increase productivity.
• Faster and better decision making: Combined with the speed of Hadoop and in-built memory analytics, along with the capacity to analyze new sources of data, organizations are able to analyze vast amounts of data instantly and make decisions based on them.
• Launching new products and/or services: Combing through large amounts of data gives the organizations the power to serve their customers on a superior scale while satisfying their needs instantly. This leads to the launch of new products and/or services to help grow and retain their existing customer base.

Here are the five V’s of Big Data and how they help organizations to scale their business:

• Volume: Sheer volume of data is one of the first features of Big Data helping businesses in making better and informed decisions. Velocity: Sometimes, Volume can be beaten by Velocity or speed of acquisition of data. This is vital as companies face cut-throat competition and speed can be a big factor in gaining an upper hand here.
• Variety: Big Data has a major advantage in obtaining data having a lot of variety. This can help companies in the service industry where variety is considered a very important feature of gaining superiority among competitors.
• Veracity: Volume and Velocity are good only when the quality of data is good, ain’t that true? Big Data comes to the rescue here by providing quality data to help in accurate decision making.
• Value: This is the most vital aspect. You have large amounts of data that are acquired at a very high speed. But, you need to know whether this is good enough or not. Big Data provides you with more than just data. It helps you analyze it by bringing value to the table.

Distributed caching is a popular method for caching storage data which has been configured across various nodes and servers in the same network. Caching the data which has been stored in similar data request pieces of information.

Benefits of Distributed Caching Method:

• Reduced Network Costs
• Enhanced Responsiveness
• Optimized performance on the same hardware settings
• Round-the-clock availability of content even during network interruptions.

Here are the reasons for using Hadoop in Data Science:

• Engaging Data with Large Datasets
• Simplified methods of Data Processing
• Using its flexible schema for Data Agility
• Providing linear scalable storage for Data Mining

FSCK is an admin command in Hadoop which is used to check the HDSF File System to enable the passing of different results with different arguments during Data Analytics.

Here are the 6 steps involved in setting up any Big Data Solution

• Analyzing the Business problem to be solved
• Vendor Selection for Hadoop Distribution
• Selecting a Deployment Strategy, i.e. On-site, cloud-based or both
• Overall Capacity Planning
• Final Infrasturce Sizing
• A Backup and Disaster Recovery Plan

JPS(Java Virtual Machine Process Status Tool) is a command which is used to display all java based processes for a particular user in Hadoop. It is also used to check all the Hadoop Daemons like Data Node, Name Node, Resource Manager and more running on the machine.

Here are the 10 most useful tools used in Big Data Solutions

• Hadoop
• Apache Spark
• Apache Storm
• Cassandra
• Rapid Miner
• MongoDB
• R Programming Tool
• Neo4j
• Apache SAMOA
• HPCC