raft cluster

wip: raft does not care about migrating

wip: optimize code

wip: raft election

wip

wip: fix raft leader missing log entries

wip

fix a dead lock

batch set slot route

wip: raft persist

wip

refactor cluster suite

remove relay

rename relay2

refactor: allow customizing client factory

test raft

refactor re-balance

avoid errors caused by inconsistent status on follower nodes during raft commits

test raft election

database/hash.go

@@ -149,7 +149,7 @@ func execHDel(db *DB, args [][]byte) redis.Reply {
 
 	deleted := 0
 	for _, field := range fields {
-		result := dict.Remove(field)
+		_, result := dict.Remove(field)
 		deleted += result
 	}
 	if dict.Len() == 0 {