YOTTABYTE ME

Here all the elements have a special purpose like a JobTracker is added in the system to perform task assignment. Tasktracker is present to perform map and reduce tasks, a very critical and important task in the whole process. NameNode is an element which comes into picture only when the Hadoop file system is used. It keeps all the file system metadata and is kept as a separate server from JobTracker. There is another NameNode, called as secondary NameNode, which has the main purpose to check-points the file system metadata periodically. Another element which plays a vital role in the Hadoop architecture is called as DataNodes. The main activity which it performs is to store HDFS files and handle HDFS read/write requests. Its location preferably exists with TaskTrackers. The placement is done because this will make the data locality optimal... So, in order to process large sets of data and huge amounts of information, one can go for MapReduce, which is an efficient, easy and user..