MapReduce——LongWritable cannot be cast to org.apache.hadoop.io.Text 错误缘由
运行环境：虚拟机，Ubuntu16，Ubuntu Server 作Hadoop集群（一主两从），编程软件eclipse。java 运行时出现以下错误： apache java.lang.Exception: java.lang.ClassCastException: org.apache.hadoop.io.LongWritable cannot be
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