Reviewed-by: Hui Fei <ferhui@apache.org> Reviewed-by: Akira Ajisaka <aajisaka@apache.org> (cherry picked from commit 6e11461eaa7dfd6e8da5d1882fb8405f983bbcb9)
HDFS-16075. Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects (#3115)
HDFS-16075. Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects (#3115)
MAPREDUCE-7354. Use empty array constant present in TaskCompletionEvent to avoid creating redundant objects (#3123)
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