expected org apache hadoop io IntWritable received org apache hadoop io LongWritable

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Hello. I am facing issue while running MapReduce program. The name of the MapReduce is WordCount which I found in a blog online. When I try to run the program. I am getting the following error:

expected org.apache.hadoop.io.IntWritable, received org.apache.hadoop.io.LongWritable
Jan 25, 2019 in Big Data Hadoop by George
 • 1,276 views
Could you please share the code you are using?
commented Jan 25, 2019 by Omkar
 • 69,220 points

1 answer to this question.

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Hey George! 

This error comes whenever you use any other serializable datatype for mapper key other than LongWritable. This happens only when using multiple mappers. Please have a look below for your reference.

image

image

image

With the right datatypes, it should work fine. Make the changes shown in the screenshots above and execute the program.

answered Jan 25, 2019 by Omkar
 • 69,220 points

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