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

cluster/del_test.go

@@ -9,6 +9,7 @@ import (
 func TestDel(t *testing.T) {
 	conn := connection.NewFakeConn()
 	allowFastTransaction = false
+	testNodeA := testCluster[0]
 	testNodeA.Exec(conn, toArgs("SET", "a", "a"))
 	ret := Del(testNodeA, conn, toArgs("DEL", "a", "b", "c"))
 	asserts.AssertNotError(t, ret)