报错信息：
System memory 259522560 must be at least 471859200. Please increase heap size using the --driver-mem
spark连接hadoop集群
解决方法：
这主要是运行内存的问题，所以我们在运行的时候更改JVM的资源分配：
或者：
val sparkConf = new SparkConf() .set("spark.testing.memory","2147480000")
异常：System memory 259522560 must be at least 471859200. Please increase heap size using the --driver-mem
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