Handling Error: Found interface org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected

Question

I am using CDH4 and have written a MapReduce application using the new mapreduce API. I have compiled it against hadoop-core-1.0.3.jar and when I run it on my Hadoop cluster

Answer 1

The answer in the link I posted in the question above asked to compile against Hadoop 2.0 library. Incidentally the post Hadoop 1.0, instead of using one single Hadoop Core jar for compilation, two (or maybe more) different jars are to be used.

I used: hadoop-common-2.0.2-alpha.jar hadoop-mapreduce-client-core-2.0.2-alpha.jar

for compiling my code and after that it ran fine w/o giving the aforementioned error.