[spark streaming]Receiver數據接收全過程詳解

一、Receiver啓動過程回顧 如圖，從ReceiverTracker的start方法開始，調用launchReceivers()方法，給endpoint發送消息，endpoint.send(StartAllReceivers(receivers))，endpoint就是ReceiverTrackerEndpoint，ReceiverTrackerEndpoint調用startReceiver方

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