Hadoop Distributed File System

Hadoop Distributed File System is a network file system connected with the Apache Hadoop project. It's sometimes sneeringly referred to as a "data store" rather than a true "file system" due to its lack of POSIX compliance (POSIX is a set of operating system standards mostly connected with Unix-style systems), but the concept of file systems predates POSIX and is not tied to one set of standards.

Software

 * libhdfs
 * WebHDFS REST API

Links

 * Hadoop official site
 * Wikipedia article: Apache Hadoop