Hi, allI have some problem with using kafka-0.7.1.  I use a cluster with 4 
brokers. They are runing well before.However, I found all brokers re-registered 
to zk yesterday. The log is blow:[2012-11-08 09:58:17,805] INFO re-registering 
broker info in ZK for broker 2 (kafka.server.KafkaZooKeeper)[2012-11-08 
09:58:17,944] INFO re-registering broker topics in ZK for broker 2 
(kafka.server.KafkaZooKeeper)......
I want to know why the brokers re-register?I had deleted some topics in ZK that 
are not used now. But I had not delete data with these topics on the 
brokers.So, this re-registry bring these topics that had been deleted into ZK 
again.
If I delete these data with these topics on the broker, and delete these topics 
in ZK, but I do not restart brokers.When the brokers re-register again, the 
brokers will bring these topics(had been deleted) into ZK ?The brokers get info 
of topics from ram or disk?
Thanks All. 

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