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

datastruct/set/set.go

@@ -25,7 +25,8 @@ func (set *Set) Add(val string) int {
 
 // Remove removes member from set
 func (set *Set) Remove(val string) int {
-	return set.dict.Remove(val)
+	_, ret := set.dict.Remove(val)
+	return ret
 }
 
 // Has returns true if the val exists in the set