关于server主从切换，proxy 的问题

version = 2018-04-07 12:12:01 +0800 @4803cffb121d21529c1717dddd2e75e3fab06ab3 @3.2.2-6-g4803cff
compile = 2018-05-30 09:40:17 +0800 by go version go1.9.2 linux/amd64
环境：172.xx.xx.185上两主，172.xx.xx.184上是172.xx.xx.185的两从
把172.xx.xx.185上两主 直接kill了，
172.xx.xx.184上的从是能正常变主，
但是codis-proxy (172.xx.xx.183)日志一直打印
2018/06/08 10:30:13 backend.go:334: [WARN] backend conn [0xc43389bda0] to 172.xx.xx.185:11194, db-0 writer-[0] exit
[error]: backend conn failure, set tcp 172.xx.xx.183:46510: use of closed network connection
2018/06/08 10:30:13 backend.go:261: [WARN] backend conn [0xc43389bda0] to 172.xx.xx.185:11194, db-0 round-[1]
2018/06/08 10:30:13 backend.go:282: [WARN] backend conn [0xc43389bda0] to 172.xx.xx.185:11194, db-0 reader-[0] exit
[error]: backend conn failure, read tcp 172.xx.xx.183:46510->172.xx.xx.185:11194: read: connection reset by peer
2018/06/08 10:30:13 backend.go:334: [WARN] backend conn [0xc43389bda0] to 172.xx.xx.185:11194, db-0 writer-[1] exit
[error]: dial tcp 172.xx.xx.185:11194: getsockopt: connection refused
3 /root/go/src/github.com/CodisLabs/codis/pkg/proxy/redis/conn.go:30
github.com/CodisLabs/codis/pkg/proxy/redis.DialTimeout
2 /root/go/src/github.com/CodisLabs/codis/pkg/proxy/backend.go:158
github.com/CodisLabs/codis/pkg/proxy.(*BackendConn).newBackendReader
1 /root/go/src/github.com/CodisLabs/codis/pkg/proxy/backend.go:337
github.com/CodisLabs/codis/pkg/proxy.(*BackendConn).loopWriter
0 /root/go/src/github.com/CodisLabs/codis/pkg/proxy/backend.go:263
github.com/CodisLabs/codis/pkg/proxy.(*BackendConn).run
... ...