private void splitAggregationStoragesAndSend(
String name, AggregationStorageMetadata metadata, AggregationStorage aggregationStorage) {
Configuration conf = Configuration.get();
int numSplits = metadata.getNumSplits();
if (numSplits == 1) {
AggregationStorageWrapper aggWrapper = new AggregationStorageWrapper(aggregationStorage);
super.setAggregatedValue(conf.getAggregationSplitName(name, 0), aggWrapper);
} else {
Collection<Writable> keysToTransfer = new ArrayList<>(aggregationStorage.getNumberMappings());
for (int i = 0; i < numSplits; ++i) {
AggregationStorage aggStorageSplit =
aggregationStorageFactory.createAggregationStorage(name);
AggregationStorageWrapper aggStorageSplitWrapper =
new AggregationStorageWrapper(aggStorageSplit);
keysToTransfer.clear();
for (Object key : aggregationStorage.getKeys()) {
int owner = key.hashCode() % numSplits;
if (owner < 0) {
owner += numSplits;
}
if (owner != i) {
continue;
}
keysToTransfer.add((Writable) key);
}
for (Writable key : keysToTransfer) {
aggStorageSplit.transferKeyFrom(key, aggregationStorage);
}
super.setAggregatedValue(conf.getAggregationSplitName(name, i), aggStorageSplitWrapper);
}
}
}
@Override
public <A extends Writable> void setAggregatedValue(String name, A value) {
AggregationStorageMetadata metadata = Configuration.get().getAggregationMetadata(name);
if (metadata == null) {
super.setAggregatedValue(name, value);
} else {
if (!(value instanceof AggregationStorage)) {
throw new RuntimeException(
"Value of an Arabesque aggregation should be a subclass of AggregationStorage");
}
AggregationStorage aggregationStorage = (AggregationStorage) value;
splitAggregationStoragesAndSend(name, metadata, aggregationStorage);
}
}