In this paper, the authors are introducing latest technology in library. As they all know Hadoop is open source software for handling big data. In present era, all library work done by the computer. Day-by-day the resources are increasing in the library so librarians are facing difficulty to handle their data with present infrastructure. In this paper, they are presenting the introduction of Hadoop, its requirement, its feathers, and need of Hadoop in the library. At the end of the paper, they gave some name of the corporate/institutions are using Hadoop.