Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1039#issuecomment-45791858
Hey @GregOwen this build is actually failing tests because of some checks
we do for binary compatibility of Spark across versions. This case you've
changed the signature of an inner function and it (falsely) detects this as an
incompatible change. You can fix this by adding an exception in
`project/MimaExcludes.scala` under 1.1:
```
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.rdd.RDD.org$apache$spark$rdd$RDD$$debugString$1")
```
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