Spark2.11 Executor的啓動註冊和執行任務的流程

1、當master在接收到RegisterApplication消息後會向worker發送LaunchDriver和LaunchExecutor消息來分別啓動Driver和Executor。實際上這裏啓動Executor是指的啓動CoarseGrainedExecutorBackend進程，而Executor只是CoarseGrainedExecutorBackend的內部的對象。spa 2、實際

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