Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4153#issuecomment-74586199
The versions used in dependencies are mostly 1.2 - 1.4, except that a test
dependency uses 1.9. So we're already manually upgrading some and downgrading
other dependencies. I believe it's a net-net small improvement to simply manage
this up to the latest version to avoid the possible bug. LGTM, tests pass.
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