Hadoop Map Reduce CustomRecordReader

Question

I followed this guide to create a custom inputsplit for hadoop. Now I have an exception each time on this:

FileSplit split = (FileSplit) genericSplit;

I imported this 2:

import org.apache.hadoop.mapred.FileSplit;
import org.apache.hadoop.mapreduce.InputSplit;

but I do not understand why give me exception. FileSplit extends the InputSplit , so why exceptions?

Answer 1

I think you want

import org.apache.hadoop.mapreduce.lib.input.FileSplit;

and not

import org.apache.hadoop.mapred.FileSplit;

Or, at the least, you seem to be mixing the use of these two different classes ( oahmapreduce.lib.input.FileSplit vs oahmapred.FileSplit ). Read your exception message carefully.