Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org> (cherry picked from commit c6539e3289711d29f508930bbda40302f48ddf4c) Conflicts: hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java Co-authored-by: Ayush Saxena <ayushsaxena@apache.org>
HADOOP-17631. Configuration ${env.VAR:-FALLBACK} to eval FALLBACK when restrictSystemProps=true (#2977)
HDFS-15916. DistCp: Backward compatibility: Distcp fails from Hadoop 3 to Hadoop 2 for snapshotdiff. (#2863). Contributed by Ayush Saxena. (#3054)
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