I found this recently and it looks pretty nice. Check out the screenshots.
Code on GH.
Short write-up on clustering Graphite.
Great (short) presentation on “Storing Time Series Metrics With Cassandra and Composite Columns” by Joe Stein from Medialets. With code on GH.
Old post, but may be useful for some redis work I’m involved with.
Basically, using redis bitmaps to quickly count summaries of active users across various time periods (daily, weekly, monthly).
Code examples in Java.