本文探讨了Apache Spark中几个关键组件的工作原理及其作为守护进程运行的方式。文章深入介绍了Akka消息流与TCP的相似之处，并提到了启动过程中的一些核心交互，如注册驱动程序和应用程序等。
there are several component entities run as daemons in spark(standalone),know to what/how they are working is necessary indeed.
akka msg flow similar to tcp
note:
register driver =RequestSubmitDriver
register app=ResigterApplication which sends by AppClient to master when startups SparkDeploySchedulerBackend in dirver
ref:
[spark-src]-source reading
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