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Audience: All Cassandra Users and Developers
User Impact: Support for fast general purpose transactions
Whitepaper: Accord

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GitHub: https://github.com/

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apache/cassandra-accord

Motivation

Users must expend significant effort to modify their database consistently while maintaining scalability. Even simple transactions involving more than one partition may become complex and error prone, as a distributed state machine must be built atop the database. Conversely, packing all of the state into one partition is not scalable.

Performance also remains an issue, despite recent Paxos improvements: latency is still twice its theoretical minimum over the wide area network, and suffers particularly badly under contention.

This work aims to improve Cassandra to support fast general purpose transactions. That is, those that may operate over any set of keys in the database atomically, modifying their contents at-once, with any action conditional on the existing contents of any key.

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