Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/8744#issuecomment-149595658
Test failed as there was a class `StubApplicationReport` which had been
deleted but the deletion not pushed up. The YARN `ApplicationReport` class has
grown on every hadoop release, and you can't have a stub/mock one that builds
across Hadoop 2.x versions. The latest history-server tests have cut the class
and are instead constructing the `ApplicationReportPBImpl` direct. And I've
filed [YARN-4279](https://issues.apache.org/jira/browse/YARN-4279) to at least
annotate the simple, stable attempt and application ID class constructors
public. If mapreduce uses them, any YARN app should be able to.
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