Hi, I need some help using Hadoop :
I'm trying to do some Dimensional reduction after this tutorial: https://cwiki.apache.org/confluence/display/MAHOUT/Dimensional+Reduction I created my tf-idf-vectors from text saved in lucene: https://cwiki.apache.org/confluence/display/MAHOUT/Creating+Vectors+from+Text Now, I got a problem when I try to transpose the tf-idf-vectors: java.lang.ClassCastException: org.apache.hadoop.io.LongWritable cannot be cast to org.apache.hadoop.io.IntWritable So, my question: What is the easiest way to get my data from SequenceFile<LongWritable,VectorWritable> to SequenceFile<IntWritable,VectorWritable>? Or can I create this directly from a Lucene-Index? Thx Stefan
