Hadoop File System was developed using distributed file system design. It runs on commodity hardware. Unlike other distributed systems, HDFS is highly faulttolerant and designed using lowcost hardware. !he purpose of distributed file systems as in HDFS is"# It is $uite e%pensive to build bigger servers with heavy configurations that handle large scale processing, # &ut as an alternative, we can tie together many commodity computers with single'(U, as a single functional distributed system, which is called cluster # !he clustered machines can read the data in parallel and provide a much higher throughput. # )oreover, it is cheaper than one high end server.