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ref: 63926a3d10ca35db6ecaa35a6271abc43acbe06f parent: 303bf77e42f84e3744c6ceac7b7f3164d289999c author: Sijia Chen <sijchen@cisco.com> date: Mon Mar 2 12:36:55 EST 2015
put a flag calculation in higher-level to save calculation in MB level