Github user andralungu commented on the pull request:
https://github.com/apache/flink/pull/1105#issuecomment-139820404
If it's okay with you, I'd like to see what @vasia has to say about adding
the Triangle Count example from the DataSet API + a reduce as a library
method. IMO, it's a better addition, but for some reason, we preferred the
Pregel/GSA implementations at a certain point (it was because in my thesis, I
take Pregel as a baseline).
Also the generic K instead of Long makes perfect sense. However, if we
decide to change it, I'll have to open a JIRA to revise the entire set of
library methods because apart from PageRank, I think they all restrict
themselves to one common key type. I would be kind of scared of type erasure in
the K implements Key case :-S
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