Hadoop is a framework that solves the main two problems of Big Data :

• Storing : HDFS distributed storing
• Processing : Yarn parallel and scalable processing

• MapReduce : software plateform provides logic of processing, using parallel distributed algorithms : Map: filter, group, sort / Reduce : aggregate, summarize
• PiG : scripting tool (programming language + environment)
• Apache Hive : similar to sequel
• MaHOOT & Spark Mlib : machine learning
• Spark : real time data analysis
• Hbase : open noSQL database
• Zookeeper & Ambari : management and coordination of jobs and services
• OOZIE : a clock, schedular
• Scoop/Floop :ingestion of data into HDFS
• HDFS
• Yarn
• Kafka/Storm

• https://www.youtube.com/watch?v=rqVuj4nft-E