出现这个问题的原因就是你创建了多个SparkContext,很显然,在main方法之外我已经创建了一个SparkContext,所以main里面的就可以删除了。
这句话的意思是,在一个Java虚拟机(JVM)中,只能运行一个SparkContext实例。SparkContext是Apache Spark的核心组件,用于与Spark集群进行交互。如果在同一个JVM中尝试创建多个SparkContext实例,就会违反这一限制,并可能引发错误。这个限制是为了防止资源冲突和数据不一致等问题。 提供解决“only one sparkcontext may be ru...
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