{"action":"created","comment":{"url":"https://api.github.com/repos/coreos/etcd/pulls/comments/26621113","id":26621113,"diff_hunk":"@@ -49,36 +49,86 @@ func (st StateType) String() string {\n \treturn stmap[uint64(st)]\n }\n \n+const (\n+\tProgressStateProbe ProgressStateType = iota\n+\tProgressStateReplicate\n+\tProgressStateSnapshot\n+)\n+\n+type ProgressStateType uint64\n+\n+var prstmap = [...]string{\n+\t\"ProgressStateProbe\",\n+\t\"ProgressStateReplicate\",\n+\t\"ProgressStateSnapshot\",\n+}\n+\n+func (st ProgressStateType) String() string { return prstmap[uint64(st)] }\n+\n type Progress struct {\n \tMatch, Next uint64\n-\tWait        int\n-\t// If the last sent to the Progress failed and reported\n-\t// by the link layer via MsgUnreachable, Unreachable will be set.\n-\t// If the Progress is unreachable, snapshot and optimistically append\n-\t// will be disabled.\n-\t// Unreachable will be unset if raft starts to receive message (msgAppResp,\n-\t// msgHeartbeatResp) from the remote peer of the Progress.\n-\tUnreachable bool\n+\t// When in ProgressStateProbe, leader sends at most one replication message\n+\t// per heartbeat interval. It also probes actual progress of the follower.\n+\t//\n+\t// When in ProgressStateReplicate, leader optimistically increases next\n+\t// to the latest entry sent after sending replication message. This is\n+\t// an optimized state for fast replicating log entries to the follower.\n+\t//\n+\t// When in ProgressStateSnapshot, leader should have sent out snapshot\n+\t// before and stops sending any replication message.\n+\tState ProgressStateType\n+\t// Paused is used in ProgressStateProbe.\n+\t// When Paused is true, progress stops sending replication message.","path":"raft/raft.go","position":41,"original_position":41,"commit_id":"1e1afb6bc223e19e6ea13083e4d6c12ae079ca37","original_commit_id":"1e1afb6bc223e19e6ea13083e4d6c12ae079ca37","user":{"login":"xiang90","id":4479947,"avatar_url":"https://avatars.githubusercontent.com/u/4479947?v=3","gravatar_id":"","url":"https://api.github.com/users/xiang90","html_url":"https://github.com/xiang90","followers_url":"https://api.github.com/users/xiang90/followers","following_url":"https://api.github.com/users/xiang90/following{/other_user}","gists_url":"https://api.github.com/users/xiang90/gists{/gist_id}","starred_url":"https://api.github.com/users/xiang90/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/xiang90/subscriptions","organizations_url":"https://api.github.com/users/xiang90/orgs","repos_url":"https://api.github.com/users/xiang90/repos","events_url":"https://api.github.com/users/xiang90/events{/privacy}","received_events_url":"https://api.github.com/users/xiang90/received_events","type":"User","site_admin":false},"body":"When 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