Map-reduce is a model for processing large sets of data in a parallel, distributed manner. This model consists of a
map method for filtering and sorting data, and a
reduce method for summarizing data. The map-reduce framework is effective because it distributes the processing of a dataset across multiple servers, performing mapping and reduction simultaneously on smaller pieces of the data. Map-reduce provides significant performance improvements when implemented in a multi-threaded manner. In this section, we will demonstrate a technique using Apache's Hadoop implementation. In the Using Java 8 to perform map-reduce section, we will discuss techniques for performing map-reduce using Java 8 streams.
Hadoop is a software ecosystem ...