Spark的学习注意2个点：

参考地址： http://spark.apache.org/docs/latest/programming-guide.html Spark的学习注意2个点： Transformations 和Actions(编码学习一定要会用API) Overview Linking with Spark Initializing Spark Using the Shell Resilient Distributed Datasets (RDDs) Which Storage Level to Choose? Removing Data Basics Passing Functions to Spark Understanding closures Working with Key-Value Pairs Transformations Actions Shuffle operations Example Local vs. cluster modes Printing elements of an RDD Background Performance Impact Parallelized Collections External Datasets RDD Operations RDD Persistence Shared Variables Broadcast Variables