SenseiDB - Distributed, Realtime, Semi-Structured Database from LinkedIn

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Sensei is a distributed data system that was built to support many product initiatives at LinkedIn, including the real-time faceted search in LinkedIn Signal and the news feed and tabs on the Homepage. Sensei is both a search engine and a database. It is designed to query and navigate through documents that consist of unstructured text and well-formed and structured metadata.

It supports Fast realtime updates, Complex query language and REST/JSON api, Hadoop integration and lot more.

http://senseidb.com/

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