Talend Data Preparation logs allows you to analyze and debug the activity of Talend Data Preparation.
Talend Data Preparation logs are located in <Data_Preparation_Path>\data\logs\app.log.
To configure the settings of your log files, edit the <Data_Preparation_Path>\config\log4j2.xml file:
For more information on how to set the log4j information level, see http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html.
For more information on how to set the log rotation, see https://logging.apache.org/log4j/2.x/manual/configuration.html#AutomaticReconfiguration.