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579dcf187a
Raft does not need to persist the commit index since a restarted node will either learn it from an append message from a leader or (if entire cluster is restarted and hence there is no leader) new leader will figure it out after contacting a quorum. But some users may want to be able to bring their local state machine to a state as up-to-date as it was before restart as soon as possible without any external communication. For them this patch introduces new persistence API that allows saving and restoring last seen committed index. Message-Id: <YfFD53oS2j1My0p/@scylladb.com>