This document discusses Hadoop infrastructure and SoftServe's experience working with Hadoop. It provides an overview of Hadoop components like HDFS, YARN, Pig, Hive, Sqoop and HBase. It also discusses popular Hadoop distributions and the Lambda architecture. The document then presents three case studies where SoftServe implemented Hadoop solutions for clients - one for log analysis, one for clickstream analysis of a retail website, and one for an online analytics platform. It provides details on the technologies used, architecture and business goals for each case study.