July 2016
Beginner to intermediate
462 pages
9h 14m
English
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Using HDFS
Hadoop Distributed File System (HDFS) is the storage component of the Hadoop framework for Big Data. HDFS is a distributed filesystem, which spreads data on multiple systems, and is inspired by the Google File System used by Google for its search engine. HDFS requires a Java Runtime Environment (JRE), and it uses a NameNode server to keep track of the files. The system also replicates the data so that losing a few nodes doesn't lead to data loss. The typical use case for HDFS is processing large read-only files. Apache Spark, also covered in this chapter, can use HDFS too.
Getting ready
Install Hadoop and a JRE. As these are not Python frameworks, you will have to check what the appropriate procedure is for your operating system. I used ...