Aws Elastic Mapreduce Doesn't Seem To Be Correctly Converting The Streaming To Jar

I have a mapper and reducer that work fine when I run them in the piped version: cat data.csv | ./mapper.py | sort -k1,1 | ./reducer.py I used the elastic mapreducer wizard, loade

Solution 1:

I was looking in the wrong log file. There is a different (there were like 6?) that actually gave me some useful python debugging information. It turned out I had used a string interpolation.format("of this kind {}, not this kind with a digit {1}".vars(a,b)) that was unsupported in python < 2.7, which was what was installed by default on the EC2 image used in elastic mapreduce.