正在使用statsd为kafka集群建立监控系统。我在用statsd图书馆。当前我的代理服务器无法启动。
我敢肯定我的问题在于我的内部配置行 server.properties 文件： metric.reporters=com.airbnb.kafka.kafka08.StatsdMetricsReporter .
当我将该行注解掉时，服务器启动。我甚至得到了statsd的确认：

[2017-06-06 15:19:35,669] INFO Reporter is enabled and starting... (com.airbnb.metrics.StatsDReporter)
[2017-06-06 15:19:35,679] INFO Started Reporter with host=localhost, port=8125, polling_period_secs=10, prefix= (com.airbnb.metrics.StatsDReporter)

然而，统计数据没有被报告（我相信），因为这也是事实： metric.reporters = [] . 因此，引起问题的那一行必须存在于属性文件中，对吗？
当我尝试启动服务器时，它失败并显示以下消息：

[2017-06-06 15:21:34,712] FATAL [Kafka Server 0], Fatal error during KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer)
java.lang.ClassCastException: class com.airbnb.kafka.kafka08.StatsdMetricsReporter
    at java.lang.Class.asSubclass(Class.java:3404)
    at org.apache.kafka.common.utils.Utils.newInstance(Utils.java:356)
    at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstances(AbstractConfig.java:243)
    at kafka.server.KafkaServer.startup(KafkaServer.scala:198)
    at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:39)
    at kafka.Kafka$.main(Kafka.scala:67)
    at kafka.Kafka.main(Kafka.scala)
[2017-06-06 15:21:34,713] INFO [Kafka Server 0], shutting down (kafka.server.KafkaServer)
[2017-06-06 15:21:34,714] INFO Terminate ZkClient event thread. (org.I0Itec.zkclient.ZkEventThread)
[2017-06-06 15:21:34,718] INFO Session: 0x15c7ed717e30004 closed (org.apache.zookeeper.ZooKeeper)
[2017-06-06 15:21:34,720] INFO EventThread shut down for session: 0x15c7ed717e30004 (org.apache.zookeeper.ClientCnxn)
[2017-06-06 15:21:34,720] INFO [Kafka Server 0], shut down completed (kafka.server.KafkaServer)
[2017-06-06 15:21:34,720] FATAL Fatal error during KafkaServerStartable startup. Prepare to shutdown (kafka.server.KafkaServerStartable)
java.lang.ClassCastException: class com.airbnb.kafka.kafka08.StatsdMetricsReporter
    at java.lang.Class.asSubclass(Class.java:3404)
    at org.apache.kafka.common.utils.Utils.newInstance(Utils.java:356)
    at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstances(AbstractConfig.java:243)
    at kafka.server.KafkaServer.startup(KafkaServer.scala:198)
    at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:39)
    at kafka.Kafka$.main(Kafka.scala:67)
    at kafka.Kafka.main(Kafka.scala)
[2017-06-06 15:21:34,721] INFO [Kafka Server 0], shutting down (kafka.server.KafkaServer)

作为记录，这里是我的配置：

kafka:type=com.airbnb.kafka.kafka08.StatsdMetricsReporter
metric.reporters=com.airbnb.kafka.kafka08.StatsdMetricsReporter
kafka.metric.reporters=com.airbnb.kafka.kafka08.StatsdMetricsReporter
external.kafka.statsd.reporter.enabled=true
external.kafka.statsd.host=localhost
external.kafka.statsd.port=8125
external.kafka.statsd.metrics.prefix=
external.kafka.statsd.tag.enabled=true