DJ.3. The Join Protocol
Having covered the discovery protocols, we continue on to describe the join protocol. This protocol makes use of the discovery protocols to provide a standard sequence of steps that services should perform when they are starting up and registering themselves with a lookup service.
DJ.3.1. Persistent State
A service must maintain certain items of state across restarts and crashes. These items are as follows:
Its service ID. A new service will not have been assigned a service ID, so this will be not be set when a service is started for the first time. After a service has been assigned a service ID, it must continue to use it across all lookup services.
A set of attributes that describe the service’s lookup service entry. ...
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