Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/5660#issuecomment-95627460
Would like to add some background about this change:
Spark SQL repackaged Hive jars to remove unnecessary shading and
dependencies. One of them is Kryo. Hive shades Kryo to package
`org.apache.hive.com.esotericsoftware`. Normally this should be fine. However,
MapR replaces Spark SQL's repackaged Hive dependencies with genuine Hive
packages, thus the reflection call mentioned in this PR couldn't find Kryo
because it's moved into another package. On the other hand, the two reflected
methods are actually quite simple. That's why we chose to reimplement them in
Spark SQL instead of using them via reflection.
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