http://storm.apache.org/releases/1.0.0/Trident-API-Overview.html
https://stackoverflow.com/questions/17257448/what-is-the-task-in-storm-parallelism
http://www.michael-noll.com/blog/2013/06/21/understanding-storm-internal-message-buffers/
http://www.michael-noll.com/blog/2013/06/21/understanding-storm-internal-message-buffers/
http://www.michael-noll.com/blog/2012/10/16/understanding-the-parallelism-of-a-storm-topology/
http://storm.apache.org/releases/1.1.0/Tutorial.html
http://storm.apache.org/releases/1.0.0/Windowing.html
http://blog.csdn.net/hguisu/article/details/8454368
http://storm.apache.org/releases/current/Tutorial.html
https://m.zhihu.com/question/29595489
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