DATABASE SYSTEMS-MINDTAPV2.0
13th Edition
ISBN: 9780357427873
Author: Coronel
Publisher: CENGAGE L
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Chapter 14, Problem 12RQ
Program Plan Intro
Hadoop Distributed File System (HDFS):
- Hadoop Distributed File System (HDFS) is the primary data storage systems usually used by the Hadoop applications.
- It was developed as an infrastructure for the Apache Nutch web search engine project and now it is an Apache Hadoop subproject.
- It includes a NameNode and DataNode architecture to implement a distributed file system that is capable of providing high-performance access to data across Hadoop clusters.
MapReduce:
- MapReduce is the processing layer of Hadoop.
- It is an open source application
programming interface that is designed to process large volumes of data in parallel. - The MapReduce framework had two main functions, Map and Reduce.
- The function of the term Map is to take a job and divide into small units of work and the function of the term Reduce is to collect the output generated from different nodes and then integrating them into a single result set.
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