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/multi_helper.go

@@ -35,6 +35,7 @@ func parseEncodedMultiRawReply(args [][]byte) (*protocol.MultiRawReply, error) {
 	return protocol.MakeMultiRawReply(cmds), nil
 }
 
+// todo: use multi raw reply instead of base64
 func encodeMultiRawReply(src *protocol.MultiRawReply) *protocol.MultiBulkReply {
 	args := make([][]byte, 0, len(src.Replies))
 	for _, rep := range src.Replies {