Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/3883#issuecomment-68904439
@shijinkui Thanks for the PR. Starting from 1.2 we're avoiding any breaking
changes, including this one since it modifies the signature of the Pregel API.
Instead it might be better to introduce a new version of the Pregel API and
keep the old version (GraphOps.pregel and Pregel.run) unmodified. Naming the
new version might be tricky -- the best I can think of is GraphOps.pregel2 and
Pregel.run2.
It would also be good to introduce any other modifications to the Pregel
API (#1217, #3866) in the same PR.
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