Cassandra is very good at storing ordered sets of data which you can then pull out the nearest value to a key. There are a load of layers on top of this that ar

Cassandra is very good at storing ordered sets of data which you can then pull out the nearest value to a key. There are a load of layers on top of this that are more specifically time-series which it probably makes sense to use rather than building your own: - https://code.google.com/p/kairosdb/ https://code.google.com/p/kairosdb/ - https://github.com/OpenNMS/newts https://github.com/OpenNMS/newts - https://github.com/rackerlabs/blueflood https://github.com/rackerlabs/blueflood - https://github.com/pyr/cyanite https://github.com/pyr/cyanite