Benchmark and Optimize Raft

[manishrjain]

I'm seeing that after proposing a mutation, it is taking over 130ms just to see it back in CommitedEntries. We should try to figure out why it takes this long to see the mutation back via Raft. What is the slowdown here? SaveToStorage, the comms, or something else?

[manishrjain]

One of the things might be that raft.Advance is slow, and needs optimization -- one of the things that needs to be done there is to add a cache in front of LastEntry API call in raft storage.

[minhaj-shakeel]

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