Kafka日志报错

[2017-11-09 18:06:23,788] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:06:30,900] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:06:38,012] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:06:45,124] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:06:52,236] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:06:59,348] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:06,460] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:13,572] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:20,684] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:27,796] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:34,908] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:42,020] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2017-11-09 18:07:49,140] WARN Connection to node 6 could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)