Oops, one more - https://github.com/apache/spark/pull/22226. I just read this thread.

2018년 9월 6일 (목) 오후 12:12, Sean Owen <srowen@apache.org>님이 작성:
(I slipped https://github.com/apache/spark/pull/22340 in for Scala 2.12. Maybe it really is the last one. In any event, yes go ahead with a 2.4 RC)

On Wed, Sep 5, 2018 at 8:14 PM Wenchen Fan <cloud0fan@gmail.com> wrote:
The repartition correctness bug fix is merged. The Scala 2.12 PRs mentioned in this thread are all merged. The Kryo upgrade is done.

I'm going to cut the branch 2.4 since all the major blockers are now resolved.