facebook/tornado — pull request #960 by mooosu (2013-12-20 03:54:38+00:00)
Title: to specify formatter by option --log_output_formatter=mylog.myFormatter;define get_prefix can override in subclass

sometimes we wanna make trivial changes to log output but we do not want to reimplement tornado.log.LogFormatter,we just need a subclass and let tornado know how to find it.