The RESTBase storage strategy has been extensively redesigned, and is now running in production on Cassandra 3.11.0. Production experience with both this new strategy, and Cassandra 3.11 are limited, and expectations are uninformed. In general, the performance of queries that are end-user facing seem quite good, and the distribution of latencies has narrowed immensely.
But 99p Cassandra-local latencies can be apparently quite high and erratic.
Obviously, the important metrics, the ones we're ultimately judged by, are the ones users are exposed to, but it would benefit us to understand this better, and if possible, identify optimizations to improve latency and overall capacity.
This ticket will track efforts to understand the current performance of the system, and identify and implement improvements.