At the time of writing, Spring Data 2.1 has database connectors for four NoSQL databases, namely MongoDB, Cassandra, Couchbase, and Redis. It's likely that Spring Data will support other data stores as well, especially the ones that communicate over HTTP by leveraging Spring WebFlux WebClient.

Here, we will not cover all the features of the Spring Data reactive connectors or their implementation details. In the previous sections, we covered a lot of that for MongoDB and Cassandra. However, let's highlight the main distinctive features for each of the reactive connectors.