Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/5085#issuecomment-84207738
> can you explain a bit why the performance impact isn't worrisome?
Because it doesn't really save a significant amount of time. Invoking
`org.apache.spark.launcher.Main` against the small library and the uber jar
results in ~50ms extra for the uber jar in my system (probably a little more if
you have spinning disks). That would still make the new launch path much faster
than the old one (see the measurements I did in the original bug, SPARK-4924).
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