metrics.reporters breaks kafka cli commands

[swood]

Hello.

I bumped into a weird problem where any Kafka cli commands are broken if there are metrics.exporter option in the Kafka server configuration file.

My current server config is:

metric.reporters=com.linkedin.kafka.cruisecontrol.metricsreporter.CruiseControlMetricsReporter
cruise.control.metrics.reporter.bootstrap.servers=10.10.10.1:9093,10.10.10.2:9093,10.10.10.3:9093
cruise.control.metrics.reporter.listener.security.protocol.map=SSL:SSL
cruise.control.metrics.reporter.ssl.keystore.type=JKS
cruise.control.metrics.reporter.ssl.truststore.type=JKS
cruise.control.metrics.reporter.ssl.client.auth=required
cruise.control.metrics.reporter.security.protocol=SSL
cruise.control.metrics.reporter.ssl.protocol=TLS
cruise.control.metrics.reporter.ssl.enabled.protocols=TLSv1.2
cruise.control.metrics.reporter.ssl.truststore.location=/etc/ssl/kafka/kafka.truststore.jks
cruise.control.metrics.reporter.ssl.keystore.location=/etc/ssl/kafka/kafka.keystore.jks
cruise.control.metrics.reporter.ssl.truststore.password=password
cruise.control.metrics.reporter.ssl.keystore.password=password
cruise.control.metrics.reporter.ssl.key.password=password

I see the broker metrics in the CruiseControl UI. However, I am getting an error if I'm trying to call any Kafka scripts:

/kafka/bin/kafka-acls.sh --bootstrap-server 10.10.10.1:9093 --command-config /kafka/server.properties --list
Error while executing ACL command: Failed to create new KafkaAdminClient
org.apache.kafka.common.KafkaException: Failed to create new KafkaAdminClient
	at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:551)
	at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:488)
	at org.apache.kafka.clients.admin.Admin.create(Admin.java:134)
	at kafka.admin.AclCommand$AdminClientService.listAcls(AclCommand.scala:100)
	at kafka.admin.AclCommand$.main(AclCommand.scala:77)
	at kafka.admin.AclCommand.main(AclCommand.scala)
Caused by: java.lang.NumberFormatException: Cannot parse null string
	at java.base/java.lang.Integer.parseInt(Integer.java:630)
	at java.base/java.lang.Integer.parseInt(Integer.java:786)
	at com.linkedin.kafka.cruisecontrol.metricsreporter.CruiseControlMetricsReporter.configure(CruiseControlMetricsReporter.java:186)
	at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstance(AbstractConfig.java:401)
	at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstances(AbstractConfig.java:482)
	at org.apache.kafka.common.config.AbstractConfig.getConfiguredInstances(AbstractConfig.java:460)
	at org.apache.kafka.clients.CommonClientConfigs.metricsReporters(CommonClientConfigs.java:238)
	at org.apache.kafka.clients.CommonClientConfigs.metricsReporters(CommonClientConfigs.java:234)
	at org.apache.kafka.clients.admin.KafkaAdminClient.createInternal(KafkaAdminClient.java:512)
	... 5 more

Does anyone know what parameter should I set to avoid this error?