Hello,
Trying to understand why my code was giving strange results, I’ve ended up
adding “useless” controls in my code and came with what seems to me a bug. I
group my dataset according to a key, but in the reduceGroup function I am
passed values with different keys.
My code has the following pattern (mix of java & pseudo-code in []) :
inputDataSet [of InputRecord]
.joinWithTiny(referencesDataSet [of Reference])
.where([InputRecord SecondaryKeySelector]).equalTo([Reference KeySelector])
.groupBy([PrimaryKeySelector : Tuple2<InputRecord, Reference> ->
value.f0.getPrimaryKey()])
.sortGroup([DateKeySelector], Order.ASCENDING)
.reduceGroup(new ReduceFunction<InputRecord, OutputRecord>() {
@Override
public void reduce(Iterable< Tuple2<InputRecord, Reference>> values,
Collector<OutputRecord> out) throws Exception {
// Issue : all values do not share the same key
final List<Tuple2<InputRecord, Reference>> listValues = new
ArrayList<Tuple2<InputRecord, Reference>>();
for (final Tuple2<InputRecord, Reference>value : values) {
listValues.add(value); }
final long primkey = listValues.get(0).f0.getPrimaryKey();
for (int i = 1; i < listValues.size(); i++) {
if (listValues.get(i).f0.getPrimaryKey() != primkey) {
throw new IllegalStateException(primkey + " != " +
listValues.get(i).f0.getPrimaryKey());
==> This exception is fired !
}
}
}
}) ;
I use the current 0.10 snapshot. The issue appears in local cluster mode unit
tests as well as in yarn mode (however it’s ok when I test it with very few
elements).
The sortGroup is not the cause of the problem, as I do get the same error
without it.
Have I misunderstood the grouping concept or is it really an awful bug?
Best regards,
Arnaud
________________________________
L'intégrité de ce message n'étant pas assurée sur internet, la société
expéditrice ne peut être tenue responsable de son contenu ni de ses pièces
jointes. Toute utilisation ou diffusion non autorisée est interdite. Si vous
n'êtes pas destinataire de ce message, merci de le détruire et d'avertir
l'expéditeur.
The integrity of this message cannot be guaranteed on the Internet. The company
that sent this message cannot therefore be held liable for its content nor
attachments. Any unauthorized use or dissemination is prohibited. If you are
not the intended recipient of this message, then please delete it and notify
the sender.
