Konstantin V Shvachko 5a714fee43 HDFS-11634. Optimize BlockIterator when interating starts in the middle. Contributed by Konstantin V Shvachko.
(cherry picked from commit 8dfcd95d580bb090af7f40af0a57061518c18c8c)

Conflicts:
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
	hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java
	hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestGetBlocks.java
2017-04-17 17:39:29 -07:00
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