etcdmain: add "--experimental-pre-vote" flag

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

etcdmain/config.go

@@ -218,6 +218,7 @@ func newConfig() *config {
 	// experimental
 	fs.BoolVar(&cfg.ec.ExperimentalInitialCorruptCheck, "experimental-initial-corrupt-check", cfg.ec.ExperimentalInitialCorruptCheck, "Enable to check data corruption before serving any client/peer traffic.")
 	fs.DurationVar(&cfg.ec.ExperimentalCorruptCheckTime, "experimental-corrupt-check-time", cfg.ec.ExperimentalCorruptCheckTime, "Duration of time between cluster corruption check passes.")
+	fs.BoolVar(&cfg.ec.ExperimentalPreVote, "experimental-pre-vote", cfg.ec.ExperimentalPreVote, "Enable to run an additional Raft election phase.")
 
 	// ignored
 	for _, f := range cfg.ignored {

etcdmain/help.go

@@ -197,5 +197,7 @@ experimental flags:
 		duration of time between cluster corruption check passes.
 	--experimental-enable-v2v3 ''
 		serve v2 requests through the v3 backend under a given prefix.
+	--experimental-pre-vote 'false'
+		enable to run an additional Raft election phase.
 `
 )