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Logging

Data Prepper uses SLF4J with a Log4j 2 binding.

For Data Prepper 2.0 or above, Log4j 2 configuration file can be found and edited in config/log4j2.properties in the application's home directory. Default properties for Log4j 2 can be found in log4j2-rolling.properties in the shared-config directory.

For Data Prepper before version 2.0, Log4j 2 configuration can be overridden by setting "log4j.configurationFile" system property when running Data Prepper. Default properties for Log4j 2 can be found in log4j2.properties in the shared-config directory.

Example:

java "-Dlog4j.configurationFile=config/custom-log4j2.properties" -jar data-prepper-core-$VERSION.jar pipelines.yaml data-prepper-config.yaml

See Log4j 2 configuration docs for more information on Log4j 2 configurations.