This article is to explain the differences between Nested Realm and Parallel Realm.
Release : 12.8.0x
Please refer to the Documentation.
Nested realm is a realm created within a realm.
Create /realm1/ realm then under it create /realm2/.
1. Realm1 with effective Resource /realm1
2. Realm2 with effective Resource /realm2
In this use case, if a user wants to access the /realm1/realm2/* resource, the user must be authorized for /realm1 before it can be evaluated for /realm2.
Parallel Realm is a way to bypass the nested realm policy evaluation.
1. Create a realm1 as /realm1
2. Create a realm2 as /realm1/realm2
In this use case, there is no dependency involved so if a user wants to access the /realm1/realm2/* resource, the user does not need to be authorized for /realm1.