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Please provide points of difference between HDFS & NFS file system.
Also, is there any similarity between the two.NFS refer to Network File System. It provides a shared directory to a number of machines that can access the directory as good as a directory on local file system. On the other end, HDFS is a distributed file system, in which different machines grouped for storing the data in a distributed way.
Following are some of the key differences:
1. In NFS, All data belonging to an entity(file or set of files) stored on a single machine and thus require a dedicated hardware. In HDFS, the same data is stored in a distributed way on set of commodity hardwares.
2. HDFS allows parallel processing of data through MapReduce. Since data on NFS is stored on a single location, it has beed read sequentially.
3. HDFS replicates the data and thus provide fault tolerance. Since data in NFS is stored on a single machine, it is difficult to access/restore if the machine goes out of network.Hope this would help.
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