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Apache Hadoop has been playing the vital role in market for storing and processing the big data. Apache Hadoop is uses the Hadoop distributed file system (HDFS) for storing the big data in distributed computing environment. It is used Map reduce to analyse and process such huge amount of data. Hadoop distributed file system is designed for storing large amount of data sets with highest amount of reliability and which stream those data sets at high bandwidth to the user applications. Apache Hadoop is provides the greatly fault tolerance and also it deployed on the low cost hardware.