Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12248#issuecomment-207146732
The MiMa failure is because `TaskContext` is a public abstract class, so
adding a new method to it breaks binary compatibility for implementors of that
class. However, `TaskContext` is not intended to actually be implemented by
users; rather, it functions more as a public interface. Therefore, it should be
safe to ignore this MiMa error:
```
[error] * abstract method
getLocalProperty(java.lang.String)java.lang.String in class
org.apache.spark.TaskContext is present only in current version
[error] filter with:
ProblemFilters.exclude[ReversedMissingMethodProblem]("org.apache.spark.TaskContext.getLocalProperty")
```
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