Github user calvinjia commented on the pull request:
https://github.com/apache/spark/pull/9395#issuecomment-153206695
@pwendell
We changed the default hadoop version from 2.2. MIMA was pulling in
`hadoop2.2` jars into the `lib_managed` directory when it built `oldDeps`. In
`spark.utils.ShutdownHookManager`, we do some reflection to see if we are using
Hadoop 2.x, and it will get a false positive leading to the failures. (See:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/util/ShutdownHookManager.scala#L221)
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