one broker id exist in topic ISR but does not exist in broker ids

[yuanjia8...@163.com]

Hi all,
    I have the problem that broker id 1 exist in one topic's ISR and is the 
only one,  but id 1 do not exist in zookeeper path /broker/ids.
    Any idea why it's happening? Is it split-brain?
    
    Thanks.



LiYuanJia