Github user ankurdave commented on the pull request: https://github.com/apache/spark/pull/3782#issuecomment-68052655 We wanted to retain binary compatibility for the Pregel API, which prevented adding the TripletFields parameter. Instead it might be better to add a second version of the Pregel API with several changes: manually-specified TripletFields, aggregateMessages-style API, and custom vertex activeness (#1217).
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