spark源碼系列01-Woker啓動Executor過程並向Driver註冊

spark版本是1.3+java   Woker啓動Executor過程並向Driver註冊時序圖：app 1.launchExecutor Master發送消息讓Worker啓動Executoride   2.Worker new()fetch Master 發送給Worker的消息，讓Worker啓動Execitor,LaunchExecutor是一個Case Class,裏面封裝之後要啓動的

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