`

hadoop mapreduce 输出不带行号（用于预处理）

 
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You can suppress the key or the value (or both, making this output format equivalent
to NullOutputFormat, which emits nothing) from the output using a NullWritable type.
This also causes no separator to be written, which makes the output suitable for reading
in using TextInputFormat.

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| hadoop mapreduce查看System.out的数据
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