Log4j: DailyRollingFileAppender with MaxFileSize Option

You could extend the FileAppender class and implement your custom version. More details DailyRollingFileAppender

You could use DailyRollingFileAppender with the hourly backup option. This will rollover the logs every hour.

Hourly Usage:

log4j.appender.A1.datePattern='.'yyyy-MM-dd-HH