The Spring Data Reactive Cassandra module may be enabled by importing the spring-boot-starter-data-cassandra-reactive starter module. Cassandra also has support for reactive repositories. The ReactiveCassandraRepository interface extends ReactiveCrudRepository and defines the capabilities of the Cassandra bases data access layer. The @Query annotation allows defining CQL3 queries manually. The @Consistency annotation can configure the desired consistency level applied to the query.
The ReactiveCassandraOperations interface and the ReactiveCassandraTemplate class give access to lower-level operations on the Cassandra database.
As of Spring Data 2.1, the reactive Cassandra connector wraps the asynchronous Cassandra driver. The Using asynchronous drivers (Cassandra) section describes how the asynchronous communication is wrapped into the reactive client.