報錯信息：
System memory 259522560 must be at least 471859200. Please increase heap size using the --driver-mem
spark連接hadoop集群
解決方法：
這主要是運行內存的問題，所以我們在運行的時候更改JVM的資源分配：
或者：
val sparkConf = new SparkConf() .set("spark.testing.memory","2147480000")
異常：System memory 259522560 must be at least 471859200. Please increase heap size using the --driver-mem
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