Hey, I think you can do it in two ways:
1. Manually increase the replication factor 2. In the server.config file, change the default.replication.factor Best, Xin On 09.01.18, 07:46, "1095193...@qq.com" <1095193...@qq.com> wrote: hi My kafka cluster has two brokers( 0 and 1) and it created __consumer_offsets topic has 50 partitions . When broker 0 failed, half of partitions failed (because topic __consumer_offsets ReplicationFactor is 1). This results consequence that my kafkaConsumer sometimes can work well and sometimes hangs with 0 outputs. My consumer generated a new goupid upon it start up . When consumer startup, it will request groupcoordinator with groupid . When Consumer's groupid is routed to a good partition, it can work well, when grouid is routed to a failed partition, it hangs with a response GROUP_COORDINATOR_NOT_AVAILABLE. I hope broker can feedback to consumer if hangs due to some __consumer_offsets partitions failed , it can help user improve expericence and debug issure fastly. 1095193...@qq.com