Estimating sizes for Cruise Control topics

[katheris]

Since Cruise Control uses a few different Kafka topics to store state we need to estimate roughly how much of our disk space will be used by the log segments for these topics. We can do this for our own topics as we can estimate it based on the retention and the size and rate of messages sent by our producing applications.

A lot of the Cruise Control documentation focuses on how it works conceptually, rather than the specific records that are being stored. Is there any documentation or recommendation for how to estimate the amount of storage that is needed for the Cruise Control internal topics?