@Override
public void operate(FlowProcess flowProcess, BufferCall bufferCall) {
Iterator<TupleEntry> it = bufferCall.getArgumentsIterator();
HyperLogLog merged = null;
try {
while (it.hasNext()) {
TupleEntry tupleEntry = it.next();
byte[] serialized = (byte[]) tupleEntry.getObject(0);
HyperLogLog hll = HyperLogLog.Builder.build(serialized);
if (merged == null) {
merged = hll;
} else {
merged = (HyperLogLog) merged.merge(hll);
}
}
} catch (Exception e) {
throw new RuntimeException(e);
}
}
@Override
public HyperLogLog combine(HyperLogLog one, HyperLogLog other) {
try {
// logger.trace("Combine called merging now " + one.cardinality() + " cardinality of other "
// + other.cardinality());
return (HyperLogLog) one.merge(other);
} catch (CardinalityMergeException e) {
logger.fatal("Cardinality merge exception " + e.getMessage());
e.printStackTrace();
}
return zero();
}