String aggregatorName = input.readUTF();
if (aggregatorName.equals(
AggregatorUtils.SPECIAL_COUNT_AGGREGATOR)) {
LongWritable count = new LongWritable(0);
count.readFields(input);
aggregatorData.receivedRequestCountFromWorker(count.get(),
getSenderTaskId());
} else {
Writable aggregatedValue =
aggregatorData.createAggregatorInitialValue(aggregatorName);
aggregatedValue.readFields(input);