Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/981#issuecomment-45431727
@darabos the compatibility issues are false positives. You can add excludes
for them in `project/MimaExcludes.scala` to work around it. We've just turned
on binary checking for Spark core and we are learning about some corner cases
in the checking tools (https://issues.apache.org/jira/browse/SPARK-2069). For
now it's fine to just add an exclude for it manually.
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