[spark streaming]Receiver数据接收全过程详解

一、Receiver启动过程回顾 如图，从ReceiverTracker的start方法开始，调用launchReceivers()方法，给endpoint发送消息，endpoint.send(StartAllReceivers(receivers))，endpoint就是ReceiverTrackerEndpoint，ReceiverTrackerEndpoint调用startReceiver方

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