Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4708#issuecomment-75492348
Hmm, it looks like MiMa is complaining about the `Stage` class becoming
abstract even though it's `private[spark]`:
```
[info] spark-core: found 1 potential binary incompatibilities (filtered 352)
[error] * class org.apache.spark.scheduler.Stage was concrete; is declared
abstract in new version
[error] filter with:
ProblemFilters.exclude[AbstractClassProblem]("org.apache.spark.scheduler.Stage")
```
We can fix this by adding an exclude. When you do this, make sure to add a
comment referencing this JIRA so we know why it was introduced.
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