IFile.Reader reader = new Reader(localFs, outputPath, null, null, null, false, -1, 1024);
DataInputBuffer keyIn = new DataInputBuffer();
DataInputBuffer valIn = new DataInputBuffer();
int records = 0;
while (reader.nextRawKey(keyIn)) {
reader.nextRawValue(valIn);
records++;
assert(keyIn.getLength() == 0);
assert(valIn.getLength() == 0);
}