
(cherry picked from commit 11d144d2284be29da1f49e163db0763636dcf058) Conflicts: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-ui/src/main/webapp/yarn.lock
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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