Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4491#issuecomment-74129728
I agree with @tgravescs that we should avoid using private APIs where
possible. On top of that, this patch would break the build for anything <
hadoop-2.6. If using these APIs, you'd have to use reflection to load them (or
use shims like sql/hive does).
When I thought about this problem, the biggest issue was to distribute the
encryption key securely. If we can do that using the `UserGroupInformation` and
`Token` classes, adding the actual encryption to the block manager shouldn't be
hard.
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