This release is data-compatible with previous GeoMesa versions back to 1.2.0. The connection parameters used for creating DataStores are compatible, but the old keys have been deprecated and new ones have been added for standardization. Client and server code is only compatible with this release - e.g. the distributed runtime code version must be updated to match the client code version. See http://www.geomesa.org/documentation/user/upgrade.html for more information.