Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/413#issuecomment-40529664
Thanks for looking at this! To add this to the test harness you can augment
`dev/scalastyle` with two additional checks:
```
SPARK_YARN=true sbt/sbt yarn/scalastyle >> scalastyle.txt
SPARK_HADOOP_VERSION=2.2.0 SPARK_YARN=true sbt/sbt yarn/scalastyle >>
scalastyle.txt
```
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