JavaPairRDD的cartesian方法讲解 官方文档说明 Return the Cartesian product of this RDD and another one, that is, the RDD of all pairs of elements (a, b) where a is in `this` and b is in `other`. 中文含义 该函数返回的是P

JavaPairRDD的aggregateByKey方法讲解 官方文档说明 Aggregate the values of each key, using given combine functions and a neutral"zero value". This function can return a different result type, U, than the type o

JavaPairRDD的aggregate方法讲解 官方文档说明 /*** Aggregate the elements of each partition, and then the results for all the partitions, using* given combine functions and a neutral "zero value". This function

安装配置 Windows下pyspark的环境搭建 环境变量： JAVA_HOME:安装文件夹/bin HADOOP_HOME:安装文件夹/lib SPARK_HOME:安装文件夹/bin SPARK_PYTHON : python安装文件夹/python.exe python中初始化sparkSession from pyspark.sql import SparkSessionspar