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Hadoop key mismatch

Larry Homes
Greenhorn

Joined: Jan 18, 2009
Posts: 25
Hello,

Hope this is the correct forum for a hadoop question.

I have a file with a bunch of lines like this:



It continues on for all 50 states, then there is another word like politics:30 Virginia ... etc.

I want to do a distributed sort on this using mapreduce. I know mapreduce sorts between the map and reduces stages, so I just want to emit from map, then from reduce without processing, but it is not working. Here is my map and reduce function:



Here is my main class



And here is the inputformat class i wrote since FileInputFormat would always fail



Here is the error




Thanks
Larry Homes
Greenhorn

Joined: Jan 18, 2009
Posts: 25
Thought I would post the solution I found. It was an incredibly dumb error on my part. In my main class, I named the Job instance sort, but then when setting the mapOutputKey, mapOutputValues, outputKey and outputValue, I use the identifier job. That identifier was from a previous mapreduce in the chain and I had just copied and pasted the code without remembering to change the job identifier.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Hadoop key mismatch
 
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