In this paper, the authors are deals with Parallel Distributed system. Hadoop has become a central platform to store big data through its Hadoop Distributed File System (HDFS) as well as to run analytics on this stored big data using its MapReduce component. Map Reduce programming model have shown great value in processing huge amount of data. Map Reduce is a common framework for data-intensive distributed computing of batch jobs. Hadoop Distributed File System (HDFS) is a Java-based file system that provides scalable and reliable data storage that is designed to span large clusters of commodity servers.