Scalar DB


A library that makes non-ACID distributed databases/storages ACID-compliant. It not only supports strongly-consistent ACID transactions, but also scales linearly and achieves high availability when it is deployed with distributed databases/storages such as Cassandra.



This library is mainly maintained by the Scalar Engineering Team, but of course we appreciate any help.

  • For asking questions, finding answers and helping other users, please go to stackoverflow and use scalardb tag.
  • For filing bugs, suggesting improvements, or requesting new features, help us out by opening an issue.

Here are the contributors we are especially thankful for: - Toshihiro Suzuki - created Phoenix adapter for Scalar DB - Yonezawa-T2 - reported bugs around Serializable and proposed a new Serializable strategy (now named Extra-Read)


Scalar DB is dual-licensed under both the Apache 2.0 License (found in the LICENSE file in the root directory) and a commercial license. You may select, at your option, one of the above-listed licenses. The commercial license includes enterprise-grade tools, such as a multi-table consistent backup/restore tool for Cassandra. Regarding the commercial license, please contact us for more information.