Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/357#issuecomment-39817720
You're not enabling the yarn-alpha build profile here, and Hadoop 0.23.x is
what it's for. Similarity for SBT although the "profile" is enabled by the
SPARK_YARN env variable. Your change just forced the config intended for
yarn-alpha into the rest of the build, which seems incorrect.
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