youtube/vitess — pull request #80 by tjyang (2014-09-07 15:30:37+00:00)
Title: Architectual  digram by Dia software

Hi there
I re-draw 3 *.png files using Dia software that is available freely on Windows, MacOS X and Linux.
Dia source is in doc/dia and doc/pdf is the pdf formats.
Hope you guys like it and accept this pull request.