@Override
public void setConf(org.apache.hadoop.conf.Configuration conf) {
if (conf == null) return; // you first get a null configuration - ignore that
String mos = conf.get(AvroJob.MAP_OUTPUT_SCHEMA);
Schema schema = Schema.parse(mos);
pair = new Pair<Object, Object>(schema);
Schema keySchema = Pair.getKeySchema(schema);
final List<Field> fields = keySchema.getFields();
final GenericRecord key = new GenericData.Record(keySchema);
projector = new Projector(key, fields);
}
