A complete list of Hadoop Interview Questions and Answers on HDFS.
As of January 31, 2013, there are 1.08 billion monthly active users on Facebook and 685 million mobile users. On an average, 3.2 billion likes and comments are posted every day on Facebook. 72% of web audience is on Facebook. There are so many activities going on facebook from wall posts, sharing images, videos, writing comments and liking posts, etc. Facebook started using Hadoop in mid-2009 and was one of the initial users of Hadoop.
Explain what are the three characteristics of Big Data according to IBM ?
The three characteristics of Big Data are:
Velocity: Analyzing 2 million records each day to identify the reason for losses.
Variety: text, images, audio, video, sensor data, log files, etc.
Volume: Twitter and Facebook generating 550+ terabytes of data per day.