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Instant MapReduce Patterns – Hadoop Essentials How-to by Srinath Perera

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Chapter 1. Instant MapReduce Patterns – Hadoop Essentials How-to

Welcome to Instant Mapreduce Patterns – Hadoop Essentials How-to. This book provides an introduction to Hadoop and discusses several Hadoop-based analysis implementations with Hadoop. It is intended to be a concise "hands-on" Hadoop guide for beginners.

Historically, data processing was completely done using database technologies. Most of the data had a well-defined structure and was often stored in databases. When handling such data, relational databases were the most common store choice. Those, datasets were small enough to be stored and queried using relational databases.

However, the datasets started to grow in size. Soon, high-tech companies like Google found many large datasets ...

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