How to configure logging for Kafka producers?

Question

I am using Kafka producer client and i don't have any log4j configuration in my project.

On running, the program prints a lot of Kafka Debug logs which i really don't want.

So, i tried to add a log4j.properties to set log level to ERROR as below which does not seem to work:

log4j.rootLogger=ERROR

How do i change Kafka Log Level?

Answer 1

Use the command line flag -Dlog4j.configuration=file:/path/to/log4j.properties when running your client.

Example log4j property files:

• https://github.com/apache/kafka/blob/trunk/config/tools-log4j.properties
  • Used by tools like mirror maker, really just stdout
• https://github.com/apache/kafka/blob/trunk/config/log4j.properties
  • Used by tools like kafka server

For mirror maker and other tools that result in a call to kafka-run-class.sh, you can use the env variable KAFKA_LOG4J_OPTS (set to something like -Dlog4j.configuration=file:/path/to/log4j.properties) to change the logging configuration. See: https://github.com/apache/kafka/blob/0.10.2/bin/kafka-run-class.sh#L158

Example of my log4j.properties file for mirror maker that I use for testing.

# https://github.com/apache/kafka/blob/trunk/config/tools-log4j.properties

log4j.rootLogger=DEBUG, stderr

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