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What is Big data,Hadoop,NoSQL and MapReduce?

Big Data, Hadoop, MapReduce,NoSQl- Three buzz words that we hear a lot these days. here is a small description on these technologies. Big Data: The name itself discloses the identity!! As we all know this is an era of information overload. Organizations have hoards of unstructured data lying around , amounting to many petabyte and exabytes. It would be a costly affair if we try to use relational databases for analyzing this data. The main purpose of analyzing this data is to recognize any repeated patterns, associations (one event connected to another),classification(looking for new patterns), and patterns in data that could lead to reasonable predictions Hadoop: It is part of the Apache project, and provides a framework for large scale data processing in a distributed computing enviornment. It can handle upto Terabytes of data and work across thousands of nodes. This is always closely associated with cloud computing, considering the requirement for large number of servers as ...