Some that I am aware of are vhector and clj-hector. Actively-maintained libraries preferred. Thanks.
DataStax is a database platform, that uses Apache Cassandra, which is built for the performance and availability demands of Web, Mobile, and IoT applications. It gives enterprises a secure always-on database that remains operationally simple when scaled in a single datacenter or across multiple data centers and clouds.
The Cassandra Query Language (CQL) is the primary language for communicating with the Apache Cassandra™ database. The most basic way to interact with Apache Cassandra is using the CQL shell, cqlsh. Using cqlsh, you can create keyspaces and tables, insert and query tables, plus much more.
I don't have first-hand knowledge, but here's a list of Cassandra Clojure libs, sorted by number of GitHub watchers:
http://clojuresphere.herokuapp.com/?sort=watchers&query=cassandra
It also shows when they were last updated. "Actively maintained" can be difficult to gauge. A lib might have an active maintainer even if it hasn't been updated in a long time. The lib may just be sufficiently-featured and bug-free.
I am using alia for this clojure-news-feed and sustaining 20000 inserts per minute with latencies of 8 ms for the mode and 47 ms for the 95 percentile. This is CQL 3.
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