config/log4j2.yaml

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Unspecified loggers and loggers with additivity=true output to server.log and stdout
# Note that INFO only applies to unspecified loggers, the log level of the child logger is used otherwise
Configuration:
  Properties:
    Property:
      # Fallback if the system property is not set
      - name: "kafka.logs.dir"
        value: "."
      - name: "logPattern"
        value: "[%d] %p %m (%c)%n"

  # Appenders configuration
  # See: https://logging.apache.org/log4j/2.x/manual/appenders.html
  Appenders:
    Console:
      name: STDOUT
      PatternLayout:
        pattern: "${logPattern}"

    RollingFile:
      - name: KafkaAppender
        fileName: "${sys:kafka.logs.dir}/server.log"
        filePattern: "${sys:kafka.logs.dir}/server.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1
      # State Change appender
      - name: StateChangeAppender
        fileName: "${sys:kafka.logs.dir}/state-change.log"
        filePattern: "${sys:kafka.logs.dir}/state-change.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1
      # Request appender
      - name: RequestAppender
        fileName: "${sys:kafka.logs.dir}/kafka-request.log"
        filePattern: "${sys:kafka.logs.dir}/kafka-request.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1
      # Cleaner appender
      - name: CleanerAppender
        fileName: "${sys:kafka.logs.dir}/log-cleaner.log"
        filePattern: "${sys:kafka.logs.dir}/log-cleaner.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1
      # Controller appender
      - name: ControllerAppender
        fileName: "${sys:kafka.logs.dir}/controller.log"
        filePattern: "${sys:kafka.logs.dir}/controller.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1
      # Authorizer appender
      - name: AuthorizerAppender
        fileName: "${sys:kafka.logs.dir}/kafka-authorizer.log"
        filePattern: "${sys:kafka.logs.dir}/kafka-authorizer.log.%d{yyyy-MM-dd-HH}"
        PatternLayout:
          pattern: "${logPattern}"
        TimeBasedTriggeringPolicy:
          modulate: true
          interval: 1

  # Loggers configuration
  # See: https://logging.apache.org/log4j/2.x/manual/configuration.html#configuring-loggers
  Loggers:
    Root:
      level: INFO
      AppenderRef:
        - ref: STDOUT
        - ref: KafkaAppender
    Logger:
      # Kafka logger
      - name: kafka
        level: INFO
      # Kafka org.apache logger
      - name: org.apache.kafka
        level: INFO
      # Kafka request logger
      - name: kafka.request.logger
        level: WARN
        additivity: false
        AppenderRef:
          ref: RequestAppender
      # Uncomment the lines below and change log4j.logger.kafka.network.RequestChannel$ to TRACE
      # for additional output related to the handling of requests
#      - name: kafka.network.Processor
#        level: TRACE
#        additivity: false
#        AppenderRef:
#          ref: RequestAppender
#      - name: kafka.server.KafkaApis
#        level: TRACE
#        additivity: false
#        AppenderRef:
#          ref: RequestAppender
      # Kafka network RequestChannel$ logger
      - name: kafka.network.RequestChannel$
        level: WARN
        additivity: false
        AppenderRef:
          ref: RequestAppender
      # Controller logger
      - name: org.apache.kafka.controller
        level: INFO
        additivity: false
        AppenderRef:
          ref: ControllerAppender
      # LogCleaner logger
      - name: org.apache.kafka.storage.internals.log.LogCleaner
        level: INFO
        additivity: false
        AppenderRef:
          ref: CleanerAppender
      - name: org.apache.kafka.storage.internals.log.LogCleaner$CleanerThread
        level: INFO
        additivity: false
        AppenderRef:
          ref: CleanerAppender
      - name: org.apache.kafka.storage.internals.log.Cleaner
        level: INFO
        additivity: false
        AppenderRef:
          ref: CleanerAppender
      # State change logger
      - name: state.change.logger
        level: INFO
        additivity: false
        AppenderRef:
          ref: StateChangeAppender
      # Authorizer logger
      - name: kafka.authorizer.logger
        level: INFO
        additivity: false
        AppenderRef:
          ref: AuthorizerAppender