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On a Map Reduce script, passing context between Reduce stage and Summary stage doesn't behave like I'd expect-
When doing a sanity check, the reduce stage gets called 100 times. Each time, I add `context.write({key:"test", value:"testing"})`
In the summary stage, I use `_context_.output.iterator().each`, and that iterates 100 times. But in my mind, it should only run 1 time, no?

If I use `context.write({key:"test", value:"testing"})` in the map stage 100 times, the reduce stage only runs 1 time.

Does the "sorting / grouping" only happen between the Map and Reduce stages?

Yes, the shuffle stage is only called between map and reduce. <https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_4387799161.html>