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Posted to dev@kafka.apache.org by "Scott Kruger (JIRA)" <ji...@apache.org> on 2016/04/06 18:44:25 UTC
[jira] [Created] (KAFKA-3516) Metrics settings in server.properties
cause ClassCastException
Scott Kruger created KAFKA-3516:
-----------------------------------
Summary: 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
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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