Spark Yarn Client模式运行流程

以wordCount程序为例:
命令行内容：
bin/spark-submit
–class WordCount
–master yarn
–deploy-mode client
./WordCount.jar
./input ./output

运行流程

命令行-脚本执行- SparkSubmit- 调用main(即Driver:执行代码-初始化SC-任务切分)-申请启动ExecutorLauncher(bin/java ExecutorLauncher)-RM(ResourceManager)- 选择一台NM启动EL- NodeManager- ExecutorLauncher（执行的还是AM(ApplicationManager)的main方法）-申请资源-启动ExecutorBackend(bin/java CoarseGrainedExecutorBackend)- 在EB内部创建Executor对象- 接受Driver分配的任务