A master URL must be set in your configuration at org.apache.spark.SparkContext.<init>(SparkContext.

　　在IDEA中运行Spark程序时报了这个错，A master URL must be set in your configuration at org.apache.spark.SparkContext.<init>(SparkContext.

　　解决方式：

进入:Run > Edit Configurations... > Application > "My project name" > Configuraton,

设置VM options项为-Dspark.master=local

-Dspark.master=local:表示设置我的spark程序以local模式运行.

 

参考文章：https://blog.csdn.net/caiandyong/article/details/51736980