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
    

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