Spark问题：System memory 259522560 must be at least 4.718592E8. Please use a larger heap size.
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在本地运行Spark程序时：报出下面的异常：
Exception in thread "main" java.lang.IllegalArgumentException:
System memory 259522560 must be at least 4.718592E8. Please use a larger heap size.
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：
-Xms128m -Xmx512m -XX:MaxPermSize=300m-ea
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