Carbon uses a custom format called whisper, which was written by Chris Davis because you can't backfill past data into rrd.
FYI graphite supports pluggable storage backends such as influxdb. Personally, I'm pretty invested in Cyanite which is a small shim ontop of Cassandra which speaks the carbon line protocol.
Once this is semi prod worthy, I'd be happy to see if we can't write one of the pluggable backends to grapbite for it, which also works with graphite-api if you want a slightly easier to setup flask based version.
FYI graphite supports pluggable storage backends such as influxdb. Personally, I'm pretty invested in Cyanite which is a small shim ontop of Cassandra which speaks the carbon line protocol.
Once this is semi prod worthy, I'd be happy to see if we can't write one of the pluggable backends to grapbite for it, which also works with graphite-api if you want a slightly easier to setup flask based version.
Disclaimer: I'm a graphite maintainer