往kafka集群发送消息时，报错如下：
page_visits-1: 30005 ms has passed since batch creation plus linger time
加入log4j.properties，设置为DEBUG级别，错误如下：
2017-06-03 17:33:31,417 DEBUG [org.apache.kafka.clients.NetworkClient] - Error connecting to node 2 at kafka-cluster-64bit:9094:
java.io.IOException: Can't resolve address: kafka-cluster-64bit:9094
at org.apache.kafka.common.network.Selector.connect(Selector.java:182)
at org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:629)
at org.apache.kafka.clients.NetworkClient.ready(NetworkClient.java:186)
at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:184)
at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:126)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.nio.channels.UnresolvedAddressException
at sun.nio.ch.Net.checkAddress(Net.java:101)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:622)
at org.apache.kafka.common.network.Selector.connect(Selector.java:179)
... 5 more
解决办法：
config/server.properties修改
修改前：listeners=PLAINTEXT://:9092
修改后：listeners=PLAINTEXT://192.168.137.176:9092
具体代码参照：Kafka JAVA客户端代码示例