Big Data

What is Big Data

Data which are very large in size is called Big Data. Normally we work on data of size MB (WordDoc ,Excel) or maximum GB(Movies, Codes) but data in Peta bytes i.e. 10^15 byte size is called Big Data. It is stated that almost 90% of today's data has been generated in the past 3 years.

From where this data comes from

These data come from many sources like

• Social networking sites: Facebook, Google, LinkedIn all these sites generates huge amount of data on a day to day basis as they have billions of users worldwide.
• E-commerce site: Sites like Amazon, Flipkart, Alibaba generates huge amount of logs from which users buying trends can be traced.
• Weather Station: All the weather station and satellite gives very huge data which are stored and manipulated to forecast weather.
• Telecom company: Telecom giants like Airtel, Vodafone study the user trends and accordingly publish their plans and for this they store the data of its million users.
• Share Market: Stock exchange across the world generates huge amount of data through its daily transaction.

3V's of Big Data

1. Velocity: The data is increasing at a very fast rate. It is estimated that the volume of data will double in every 2 years.
2. Veracity: Now a days data are not stored in rows and column. Data is structured as well as unstructured. Log file, CCTV footage is unstructured data. Data which can be saved in tables are structured data like the transaction data of the bank.
3. Volume: The amount of data which we deal with is of very large size of Peta bytes.

Current Issues

Huge amount of unstructured data which needs to be stored, processed and analyzed.

Provided Solution

Storage: This huge amount of data, Hadoop uses HDFS (Hadoop Distributed File System) which uses commodity hardware to form clusters and store data in a distributed fashion. It works on Write once, read many times principle.

Processing: Map Reduce paradigm is applied to data distributed over network to find the required output.

Analyze: Pig, Hive can be used to analyze the data.

Cost: Hadoop is open source so the cost is no more an issue.

NOTE: HADOOP IS A SOLUTION FOR BIG DATA ISSUE/PROBLEM.

Why you should learn big data?

• 6.4 Lakhs IT jobs will be lost to automation by 2021 – NASSCOM
• Big data jobs are on the rise, 2 Lakhs big data professionals will be required by 2021– Economic Times
• Big data professionals earn 35% more than others – Randstad