Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5691#issuecomment-141089285
@wb14123 This issue concerns updating Spark's json4s. If you want to pursue
that, you can open a PR, but the question will be the same: does it cause any
compatibility problem?
However your purpose is simply to use json4s in your app. It's not shaded
in Spark. You need to use the 'userClassPathFirst' options in Spark to make
your copy take precedence. This does not involve updating Spark.
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