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Logging

Brokers

Kafka brokers use Apache Log4j 2 for logging and use config/log4j.properties by default.

The default logging level is INFO with stdout appender.

log4j.rootLogger=INFO, stdout, kafkaAppender

log4j.logger.kafka=INFO
log4j.logger.org.apache.kafka=INFO

Tools

Kafka tools (e.g. kafka-console-producer) use config/tools-log4j.properties as the logging configuration file.

Clients

build.sbt

libraryDependencies += "org.apache.kafka" % "kafka-clients" % "2.8.0"

val slf4j = "1.7.32"
libraryDependencies += "org.slf4j" % "slf4j-api" % slf4j
libraryDependencies += "org.slf4j" % "slf4j-log4j12" % slf4j

log4j.properties

In src/main/resources/log4j.properties use the following:

log4j.rootLogger=INFO, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d] %p %m (%c)%n

log4j.logger.org.apache.kafka.clients.producer.KafkaProducer=ALL
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