问题解决了
改变了bootstrap端口到9093.。 停止和producer通信。重启broker。
然后ISR就和 RF 一样了
[2018-08-08 16:21:12,773] WARN Received a PartitionLeaderEpoch assignment for an epoch < latestEpoch. This implies messages have arrived out of order. New: {epoch:13, offset:89409682}, Current: {epoch:38, offset84236994} for Partition: prod-rm-bp1p125xw0bvcey34-2 (kafka.server.epoch.LeaderEpochFileCache)