Github user ehnalis commented on the pull request:
https://github.com/apache/spark/pull/8979#issuecomment-164769323
On a 4 node YARN cluster I've measured a 38% shuffle-size reduction when
the payload was an (Int, String) pair (JavaSerializer), where the average
length of String was 5.1 (English word). I did not benchmark time.
Practically you save an `Int` on each record.
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