Components of Hadoop
The broad Hadoop umbrella project has many component subprojects, and we'll discuss several of them in this book. At its core, Hadoop provides two services: storage and computation. A typical Hadoop workflow consists of loading data into the Hadoop Distributed File System (HDFS) and processing using the MapReduce API or several tools that rely on MapReduce as an execution framework.
Hadoop 1: HDFS and MapReduce
Both layers are direct implementations of Google's own GFS and MapReduce technologies.
Common building blocks
Both HDFS and MapReduce exhibit several of the architectural principles described in the previous section. In particular, ...
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