> Do any Cass developers have any thoughts on this and whether or not it would > be helpful considering Cass' architecture and operation?
A well-functioning L2 cache should definitely be very useful with Cassandra for read-intensive workloads where the request distribution is such that additional caching will be beneficial. However, it will depend in any particular case on how the L2 cache works, and what your request distribution is like. I have been wanting to try flashcache but haven't yet, so I cannot speak to it. In particular though, keep in mind that if you've got say 1 tb of data and your memory is enough to keep the hot set, and you're disk I/O is coming form the long tail, increasing the amount of cache to 200 gig may not necessarily give you a huge improvement in terms of percentages. -- / Peter Schuller
