The rolling grouping file appender allows to roll over on a specific interval(TimeBasedRollingPolicy) or when the log file has reached a specific file size. But unfortunately Logback does not support both to use together. For example if i want to roll over every day but i also want to roll the file when it is greater than 100MB.

Please consider adding this feature to Logback and feel free to contact me if further clarification is required.
Thanks,
Zoltan Szel