Yes exactly, when the master aggregation triggers the vertex is NULL. Please look at the docs, I think it is described pretty nicely there ;)
2012/12/4 lee fei <[email protected]> > Hi, > Did the aggregate() method always will be called after call compute() > method when an vertex start? > If so, I can submit an value to the aggregator via aggregate(). > > Thank you for your attention! >
