Note: Default settings on the properties file are:
log4j.appender.file.MaxFileSize=2MB
log4j.appender.file.MaxBackupIndex=20
where MaxFileSize = Maximum allowed file size (in bytes) before rolling over. Suffixes "KB", "MB" and "GB" are allowed.
MaxBackupIndex=Maximum number of backup files to keep.
It can be set to lesser values, for example:
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=10