In chubby the process of each log that write to db is one instance of the paxos process, and this instance may have many proposers, so it will have a master selected process. why it has many proposers?
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Having a single leader (aka a "Distinguished Proposer") is an optimization for Paxos. The whole point of Paxos is to decide a value when there are multiple proposers proposing different things.
The whole point of having multiple proposers is in case the "Distinguished Proposer" fails; something has to pick up that new role. Paxos, when it decides a value, implicitly decides between proposers.
As in your other question, I suggest looking at the other Paxos questions, perhaps read Paxos Made Simple.
Michael Deardeuff
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