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1.问题:.问题:bin/bin/spark-shell 启动报错
  java.lang.IllegalArgumentException: System memory 257949696 must be at least 4.718592E8. Please use a larger heap size.
2.解决方案:修改配置文件conf/spark-env.sh
  SPARK_DRIVER_MEMORY=512M  #或者更大

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