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https://issues.apache.org/jira/browse/KAFKA-3516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manikumar Reddy resolved KAFKA-3516.
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Resolution: Not A Problem
Fix Version/s: 0.10.0.0
"kafka.metrics.KafkaCSVMetricsReporter" is old Metrics reporter class. In
future, we are going to remove these deprecated classes. This reporter still
used in ConsoleConsumer and ProducerPerformance tools.
"metric.reporters" config property accepts implementations of MetricReporter
interface. Currently we don't have inbuilt implementations for CSV Reporting.
> Metrics settings in server.properties cause ClassCastException
> --------------------------------------------------------------
>
> Key: KAFKA-3516
> URL: https://issues.apache.org/jira/browse/KAFKA-3516
> Project: Kafka
> Issue Type: Bug
> Components: config
> Affects Versions: 0.9.0.1
> Reporter: Scott Kruger
> Assignee: Manikumar Reddy
> Fix For: 0.10.0.0
>
>
> The docs indicate that metrics reporters should be enabled with the
> `metric.reporters` setting in `server.properties`. However, setting it to
> `kafka.metrics.KafkaCSVMetricsReporter` causes the following exception in the
> server log:
> {noformat}
> [2016-04-06 16:17:42,010] FATAL (kafka.Kafka$)
> java.lang.ClassCastException: class kafka.metrics.KafkaCSVMetricsReporter
> at java.lang.Class.asSubclass(Class.java:3404)
> at org.apache.kafka.common.utils.Utils.newInstance(Utils.java:328)
> at
> org.apache.kafka.common.config.AbstractConfig.getConfiguredInstances(AbstractConfig.java:202)
> at kafka.server.KafkaConfig.<init>(KafkaConfig.scala:830)
> at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:698)
> at kafka.server.KafkaConfig$.fromProps(KafkaConfig.scala:695)
> at
> kafka.server.KafkaServerStartable$.fromProps(KafkaServerStartable.scala:28)
> at kafka.Kafka$.main(Kafka.scala:58)
> at kafka.Kafka.main(Kafka.scala)
> {noformat}
> Using the `kafka.metrics.reporters` setting instead fixes the issue.
> I imagine that either the docs are wrong, or that setting is meant for other
> metrics reporters.
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