/**
* Constructs the DelegatingRecordReader.
*
* @param split TaggegInputSplit object
* @param context TaskAttemptContext object
* @throws IOException
* @throws InterruptedException
*/
@SuppressWarnings("unchecked")
public DelegatingRecordReader(InputSplit split, TaskAttemptContext context)
throws IOException, InterruptedException {
// Find the InputFormat and then the RecordReader from the
// TaggedInputSplit.
TaggedInputSplit taggedInputSplit = (TaggedInputSplit) split;
InputFormat<K, V> inputFormat =
(InputFormat<K, V>)
DCUtils.loadSerializedObjectInDC(
context.getConfiguration(),
InputFormat.class,
taggedInputSplit.getInputFormatFile(),
true);
originalRR = inputFormat.createRecordReader(taggedInputSplit.getInputSplit(), context);
}
@SuppressWarnings("unchecked")
private void initHandlerContextAndCollector(Context context)
throws IOException, InterruptedException, TupleMRException {
String fileName = context.getConfiguration().get(SimpleReducer.CONF_REDUCER_HANDLER);
handler =
DCUtils.loadSerializedObjectInDC(
context.getConfiguration(), TupleRollupReducer.class, fileName, true);
collector =
handler
.new Collector((ReduceContext<DatumWrapper<ITuple>, NullWritable, Object, Object>) context);
this.context =
new TupleMRContext(
(ReduceContext<DatumWrapper<ITuple>, NullWritable, Object, Object>) context,
tupleMRConfig);
handler.setup(this.context, collector);
}
