Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/1553#issuecomment-49952509
Informal benchmark: I constructed a graph locally to compare the
communication cost of building the routing table before and after. On a graph
with 13M edges, this PR reduces the shuffle size slightly (2.3 MB to 2.04 MB).
The shuffle time wasn't measurably different, but for a larger graph it should
also go down slightly because of less memory allocation and a simpler
serializer (fixed-size int instead of variable-length).
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