(cherry picked from commit d9fbb3c5082baf301b082f51eea2f8a2e25e8715)
HDFS-16075. Use empty array constants present in StorageType and DatanodeInfo to avoid creating redundant objects (#3115)
HDFS-16082. Atomic operations on exceptionsSinceLastBalance and failedTimesSinceLastSuccessfulBalance in Balancer (#3127)
MAPREDUCE-7354. Use empty array constant present in TaskCompletionEvent to avoid creating redundant objects (#3123)
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