How does FaunaDB achieves atomicity without some sort of 2 phase commit? What I understood from the article is that each node in a replica commits independently

How does FaunaDB achieves atomicity without some sort of 2 phase commit? What I understood from the article is that each node in a replica commits independently from the distributed transaction log. So, if a transaction updates data in multiple nodes in a replica then it can happen that one of the commit in one of the nodes fails because of some failure. In that case will there be partial commit?