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It appears that Paxos will be used in the third lab, http://pdos.csail.mit.edu/6.824/labs/lab-3.html.

In the 2010 version of this course, we implemented paxos on one of the later labs. It was considered one of the hardest I think.

How is Paxos hard? Inventing Paxos is hard. Implementing it is implementing a well-specified state machine.