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Title: 4 - Identity Backend
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# 4 - Identity Backend
A standalone KDC server that can integrate various identity back ends including:
* MemoryIdentityBackend.
* It is default Identity Backend, and no cofiguration is needed. This backend is for no permanent storage requirements.
* JsonIdentityBackend.
* It implemented by Gson which is used to convert Java Objects into their JSON representation and convert a JSON string to an equivalent Java object. A json file will be created in "backend.json.file". This backend is for small, easy, development and test environment.
* ZookeeperIdentityBackend.
* Currently it uses an embedded Zookeeper. In follow up it will be enhanced to support standalone Zookeeper cluster for replication and reliability. Zookeeper backend would be a good choice for high reliability, high performance and high scalability requirement and scenarios.
* LdapIdentityBackend.
* The Ldap server can be standalone or embedded using ApacheDS server as the backend. It is used when there is exist ldap server.
* MavibotBackend.
* A backend based on Apache Mavibot(an MVCC BTree library).