Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/2249#issuecomment-81476933
@uncleGen Yeah, unfortunately we can't add optional parameters anymore, and
workarounds like adding a set of new methods seem too messy. We could just add
a single new method `Graph#reindex` that rebuilds the routing table. But users
can already just do `Graph(g.vertices, g.edges)` to get the same effect, though
with a performance penalty for rebuilding the rest of the data structures as
well.
So let's close this issue.
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