MySQL 7.3 Cluster has been finally released as a general availability (GA) release. From now on foreign keys are fully supported in MySQL Cluster as well as new NoSQL JavaScript with node.js, Foreign Keys, and Auto-Tuned Clustering features. You can download it freely from mysql.com
Brief info from mysql.com:
MySQL Cluster is a write-scalable, real-time, ACID-compliant transactional database, designed to deliver 99.999% availability. With a distributed, multi-master architecture and no single point of failure, MySQL Cluster scales horizontally on commodity hardware with auto-sharding (partitioning) to serve read and write intensive workloads, accessed via SQL and NoSQL interfaces.
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