@LeticiaAraujo Log4j properties set the properties that control logging activities for each service running in your Hadoop cluster. This is something that every site can customize according to its needs like enabling DEBUG will generate detailed by huge logs is you want to analyze the issue with your service. Rotation of the logs, compression format or logfile size etc Logging services is a topic on its own, and here is a good source for reading log4j the most common task is enabling DEBUG and Log rotation and it's date format.
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