Github user okram commented on the pull request:
https://github.com/apache/incubator-tinkerpop/pull/316#issuecomment-220440890
These are "master traversal" traversers. Even before when it was stored in
sideeffects, those are ultimately stored in `Configuration` (`TRAVERSAL`). Its
the same scalability as before, just better semantics as we shouldn't store
halted traversers as side-effects (they have "left the traversal"). Finally,
since the beginning, OLAP reductions to the master traversal are only as
scalable as the single machine it comes back to. Thus, groups(), limits(),
groupCounts(), sums(), etc. are important. There is no `g.V()` on a billion
vertex graph and stream back results.
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