Hadoop中mapreduce运行WordCount程序报错Error: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, received org.apache.hadoop.io.LongWritable

这个问题是因为map的方法参数与继承mapper定义的参数类型不一致导致的，

Hadoop中mapreduce运行WordCount程序报错Error: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, received org.apache.hadoop.io.LongWritableHadoop中mapreduce运行WordCount程序报错Error: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, received org.apache.hadoop.io.LongWritable应该将Mapper的key参数类型设置成Object，就可以解决这个问题

Hadoop中mapreduce运行WordCount程序报错Error: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.Text, received org.apache.hadoop.io.LongWritable

 

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