What is Hadoop?
Apache Hadoop is an open-source java framework that is used to store,analyze and process Big data in a distributed environment across clusters of computers. It is used by Google, Facebook, Yahoo, Youtube, Twitter, LinkedIn and many more. Hadoop is top level apache project developed by Doug Cutting. It works on distributed system. It is inspired by google mapreduce algorithm for running distributed application. Hadoop could be good if you have a lot of data you do not know what to do and you do not want to loose it.
Hadoop is initiated and led by YAHOO. hadoop is written in java programming language with some code in C and some commands in shell-scripts. Companies that offer hadoop services are - IBM, Amazon Web Services, Cloudera, Microsoft Azure, Dell.
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