The document discusses the design and implementation of distributed counters in Cassandra. It aims to provide low latency and high availability counters. The design relaxes consistency constraints by using commutative operations, partitioning work across replicas, and allowing idempotent repairs. Counters are implemented using a context format to track counts across replicas, with writes incrementing local counts and repairs retaining the highest counts seen. Eventual consistency is achieved through read repair and anti-entropy repairs that propagate counter states.