This reverts commit 8c0f9480549a4e7fa7de02c9bf73bccb0381f22a.
HDFS-15916. DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff. (#2863). Contributed by Ayush Saxena. (#3054)
YARN-10803. [JDK 11] TestRMFailoverProxyProvider and TestNoHaRMFailoverProxyProvider fails by ClassCastException. (#3068)
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