Github user cmccabe commented on the pull request:
https://github.com/apache/spark/pull/850#issuecomment-44458395
So I was unable to reproduce the failure without this patch on CDH5.1.0.
It looks like it might have been a bad build (I didn't clean enough).
On a more positive note, I confirmed that we cannot build against hadoop
3.0.0 without this patch. We get errors like
[error]
/home/cmccabe/spark/b3.0/yarn/alpha/src/main/scala/org/apache/spark/deploy/yarn/Client.scala:29:
object YarnClientImpl is not a member of package org.apache.hadoop.yarn.client
[error] import org.apache.hadoop.yarn.client.YarnClientImpl
[error] ^
[error]
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