(cherry picked from commit 93a1685073d76bef5c6ad3819e7710317733bd7a)
HDFS-16075. Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects (#3115)
HADOOP-17769. Upgrade JUnit to 4.13.2. fixes TestBlockRecovery (#3130). Contributed by Ahmed Hussein. (#3138)
HADOOP-17764. S3AInputStream read does not re-open the input stream on the second read retry attempt (#3109)
HADOOP-17769. Upgrade JUnit to 4.13.2. fixes TestBlockRecovery (#3130). Contributed by Ahmed Hussein. (#3138)
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