kafka shutdown automatically

Hi，

our kafka cluster is shut down automatically today, here is the log.

I don't find any error log. Anything wrong?

[2015-01-18 05:01:01,788] INFO [BrokerChangeListener on Controller 0]:
Broker change listener fired for path /brokers/ids with children 0
(kafka.controller.ReplicaStateMachine$BrokerChangeListener)

[2015-01-18 05:01:01,791] INFO [Controller-0-to-broker-1-send-thread],
Shutting down (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller-0-to-broker-1-send-thread],
Stopped (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller-0-to-broker-1-send-thread],
Shutdown completed (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller-0-to-broker-0-send-thread],
Shutting down (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller-0-to-broker-0-send-thread],
Stopped (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller-0-to-broker-0-send-thread],
Shutdown completed (kafka.controller.RequestSendThread)

[2015-01-18 05:01:01,792] INFO [Controller 0]: Controller shutdown complete
(kafka.controller.KafkaController)