Apache
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I'm sure you're familiar with the traditional interface model for a web application. The user requests a page from the server, which is built and delivered to the browser. This page includes an HTML form element for capturing data from the user. Once the user posts their input back to the server, the next page can be built and served based on the input, and so the process continues.
Very Dynamic Web Interfaces
CouchDB provides a RESTful JSON API than can be accessed from any environment that allows HTTP requests. There are myriad third-party client libraries that make this even easier from your programming language of choice. CouchDB’s built in Web administration console speaks directly to the database using HTTP requests issued from your browser. CouchDB is written in Erlang , a robust functional programming language ideal for building concurrent distributed systems. Erlang allows for a flexible design that is easily scalable and readily extensible. Read the introduction and the technical overview to learn more about the design and basic concepts of CouchDB.
Apache CouchDB: The CouchDB Project
The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using a simple programming model. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-avaiability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-availabile service on top of a cluster of computers, each of which may be prone to failures. A wide variety of companies and organizations use Hadoop for both research and production. Users are encouraged to add themselves to the Hadoop PoweredBy wiki page. Described by the judging panel as a "Swiss army knife of the 21st century", Apache Hadoop picked up the innovator of the year award for having the potential to change the face of media innovations.