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The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on
commodity hardware. It has many similarities with existing distributed file systems.
However, the differences from other distributed file systems are significant. HDFS is highly
fault-tolerant and is designed to be deployed on low-cost hardware. HDFS provides high
throughput access to application data and is suitable for applications that have large data sets.
HDFS relaxes a few POSIX requirements to enable streaming access to file system data.

We have designed and implemented the Google File System, a scalable distributed file system for large distributed data-intensive applications. It provides fault tolerance while running on inexpensive commodity hardware, and it delivers high aggregate performance to a large number of clients.