etcd is designed to store app settings, data for service discovery, feature flag...

robszumski on Feb 11, 2015 | parent | context | favorite | on: Etcd 2.0 – First Major Stable Release

etcd is designed to store app settings, data for service discovery, feature flags, distributed locks, that type of thing. It's not a general purpose data store and it isn't designed to store data in the same way you would use Cassandra.