add I found some log from server.log 
 
[2014-02-18 00:27:54,460] INFO re-registering broker info in ZK for broker 2 
(kafka.server.KafkaHealthcheck)
[2014-02-18 00:27:54,477] INFO Registered broker 2 at path /brokers/ids/2 with 
address xseed133.kdev.nhnsystem.com:9093. (kafka.utils.ZkUtils$)
[2014-02-18 00:27:54,481] INFO done re-registering broker 
(kafka.server.KafkaHealthcheck)
[2014-02-18 00:27:54,483] INFO Subscribing to /brokers/topics path to watch for 
new topics (kafka.server.KafkaHealthcheck)
[2014-02-18 00:27:54,614] INFO 2 successfully elected as leader 
(kafka.server.ZookeeperLeaderElector)
[2014-02-18 00:27:55,882] INFO New leader is 2 
(kafka.server.ZookeeperLeaderElector$LeaderChangeListener)

Best Regards
Jerry
-----Original Message-----
From: "陈小军"<chenxiao...@nhn.com> 
To: <users@kafka.apache.org>; 
Cc: 
Sent: 2014-02-18 (星期二) 10:41:00
Subject: kafka leader automatic changed

Hi, 
   I running kafka 0.8.1 branch code. in my test env, I have 3 servers (broker 
1, 2, 3), and create three topics with 3 partitions and 2 replica for each 
partition. at beginning each partition's leader is allocated to different 
server.
   topicA : partition 0  --> leader : 1; partition 1  --> leader : 
2;partition 2  --> leader : 3
 
 but this morning, I check the status of kafka, the leader of partitions changed
   topicA : partition 0  --> leader : 2 ; partition 1  --> leader : 
2;partition 2  --> leader : 3


  I don't why this situation happend. during the night there is no data send to 
kafka. 
  Does someone know about this?
 
  Thanks~!


Best Regards
Jerry 

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