Moscow Cassandra Users
http://www.meetup.com/Moscow-Cassandra-Users/
The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model. The Moscow Apache Cassandra User Group is a highly awesome meetup group, bringing together cool people distributed across Moscow to talk about our favorite NoSQL implementation, Apache Cassandra.
Hashtag
#yagosti
Official web-site
https://tech.yandex.ru/events/yagosti/04-oct-2014/
Contacts