Comment by gtrubetskoy

IMHO if your volume is not in 300K data points per second, there is still plain old PostgreSQL, which is perfectly suitable for storing time-series and is time-tested and very reliable, allowing you to keep your TS data alongside your other (business) data so that you can analyze it all together without having to extract out of unfamiliar storage. I've hacked a project which demonstrates how it can be done, see https://github.com/grisha/timeriver and my blog explaining the technique http://grisha.org/blog/2015/09/23/storing-time-series-in-pos...