Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2624#issuecomment-57721877
@davies The SparkEnv class is marked `@developerAPI` and has this note in
its Scaladoc:
```
* NOTE: This is not intended for external use. This is exposed for Shark
and may be made private
* in a future release.
```
Nearly every object that's accessible through SparkEnv's public fields is
`private[spark]`. I'd be _very_ surprised if there was third-party code that
was relying on SparkEnv remaining backwards-compatible.
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