Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/2454#issuecomment-56286238
I don't think the overhead of reading the file is significant here, but
agree it's nice to avoid extra print statements. `lazy val`'s like this are a
little brittle because they make the access order sensitive. I.e. if someone
tries to reference this earlier in the program it will break in a weird way.
Nonetheless think this is fine to have. It's a small enough code segment
here. I'll merge it and make the minor style fix suggested here.
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