What is the purpose of Infinispan AtomicMap in JDG and how can I use it?

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Issue

How can I use a cache with AtomicMap?
What is the purpose of AtomicMap and when I should use it?
Do I need a transaction if I use AtomicMap's
Is it possible to have a imbricated AtomicMap?

Environment

Red Hat JBoss Data Grid
- 6.x

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