Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/9221#issuecomment-150296842
slf4j & log4j are in sync with Spark 1.6. I can't actually see an explicit
ref to commons-logging in the spark poms (just lots of exclusions of the hadoop
one), but some indirect references come in at v 1.1.3.
That leaves kryo. Precisely because this is a very old import with
different package names, this isn't going to be as fraught as trouble as the
main kryo package.
mvn repo [says its just for testing
anyway](http://mvnrepository.com/artifact/org.twitter4j/twitter4j-core/4.0.4)
No sign of the other troublespots: guava, jackson, jetty...
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