Top Five Hadoop Interview Questions 1. What do the four V’s of Big Data denote? Volume : The volume represents the amount of data which is growing at an exponential rate i.e. in Petabytes and Exabytes. Velocity : Velocity refers to the rate at which data is growing, which is very fast. Today, yesterday’s data are considered as old data. Nowadays, social media is a major contributor in the velocity of growing data. Variety : Variety refers to the heterogeneity of data types. In another word, the data which are gathered has a variety of formats like videos, audios, csv, etc. So, these various formats represent the variety of data. Veracity : Veracity refers to the data in doubt or uncertainty of data available due to data inconsistency and incompleteness. 2. What are the most common Input Formats in Hadoop? There are three most common input formats in Hadoop: Text Input Format: Default input format in Hadoop. Key Value Input Format: used for plain text...
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