在运行pyspark的时候初始化sc失败，报错如下所示：

19/01/30 15:42:55 ERROR SparkContext: Error initializing SparkContext.
java.lang.IllegalArgumentException: System memory 466092032 must be at least 471859200. Please increase heap size using the --driver-memory option or spark.driver.memory in Spark configuration.
	at org.apache.spark.memory.UnifiedMemoryManager$.getMaxMemory(UnifiedMemoryManager.scala:216)
	at org.apache.spark.memory.UnifiedMemoryManager$.apply(UnifiedMemoryManager.scala:198)
	at org.apache.spark.SparkEnv$.create(SparkEnv.scala:330)
	at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:174)
	at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:257)
	at org.apache.spark.SparkContext.<init>(SparkContext.scala:432)
	at org.apache.spark.api.java.JavaSparkContext.<init>(JavaSparkContext.scala:58)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:247)
	at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
	at py4j.Gateway.invoke(Gateway.java:236)
	at py4j.commands.ConstructorCommand.invokeConstructor(ConstructorCommand.java:80)
	at py4j.commands.ConstructorCommand.execute(ConstructorCommand.java:69)
	at py4j.GatewayConnection.run(GatewayConnection.java:214)
	at java.lang.Thread.run(Thread.java:748)

答：从报错信息信息来看，这是由于驱动内存不足引起的将驱动内存更改为512m以上就可以了。具体配置方法有多种，这里介绍一种

编辑spark/conf目录下的spark-defaults.conf文件添加如下内容

spark.driver.memory                600m