We're currently evaluating DSE Cassandra as a data store and are also separately interested in using the Cassandra cache in lieu of a dedicated cache - the data cached would completely fit in-memory for our particular use case.
The 1.0 tuning documentation states the following:
"Some Cassandra production deployments have leveraged Cassandra's caching features to the point where dedicated caching tools such as memcached could be completely replaced."
However the latest documentation does not mention this sort of use for the Cassandra cache. Is anyone still using doing this?