spark源码阅读 https://juejin.im/post/5d19d133f265da1b971a8c06 https://www.yisu.com/zixun/tags/spark/p28.html https://dongkelun.com/2018/06/20/sparkStreamingOffsetOnlyOnce/ http://dmlcoding.com/Spark.html https://www.cnblogs.com/frankdeng/p/9301752.html (包含spark集群启动等几个脚本的解析)