twitter/zipkin — pull request #353 by suchang (2014-03-07 00:10:29+00:00)
Title: Add injection of Map[String, List[Long]] for span duration aggregation

In order to support span duration in the summingbird job, an injection of Map[String, List[Long]] is added. Summingbird job can aggregate the duration of the spans(List[Long]) and come up with stats such as avg, p99 etc