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The steps for authentication is illustrated in the three pictures below.
As shown above, when a user wants to authenticate, Datafari first calls CombinedRealm.
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Regarding the Cassandra realm configuration: by default, the Cassandra database requires no username and password. Still, you should definitely add a password and a username for the connection your Cassandra. Once this is done, fill in these information in defaultDbUser and defaultDbPass.