MapReduce——LongWritable cannot be cast to org.apache.hadoop.io.Text 錯誤緣由
運行環境：虛擬機，Ubuntu16，Ubuntu Server 作Hadoop集羣（一主兩從），編程軟件eclipse。java 運行時出現以下錯誤： apache java.lang.Exception: java.lang.ClassCastException: org.apache.hadoop.io.LongWritable cannot be
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