第11课：Spark Streaming源码解读之Driver中的ReceiverTracker架构设计以及具体实现彻底研究 /* 王家林老师授课http://weibo.com/ilovepains 每天晚上20：00YY频道现场授课频道68917580*/ 1,ReceiverTracker架构设计 2，消息循环系统 3，ReceiverTracker具体实现
ReceiverTracker以driver中的算法在executor启动receive，封装成一个一个job。
ReceivedBlockHandler
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