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Replace...
https://github.com/apache/hadoop/blob/d8bac50e12d243ef8fd2c7e0ce5c9997131dee74/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java#L86
With...
https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingQueue.html
GitHub Pull Request #1422