Konstantin Shvachko created HDFS-11634:
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Summary: Optimize BlockIterator when interating starts in the
middle.
Key: HDFS-11634
URL: https://issues.apache.org/jira/browse/HDFS-11634
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 2.6.5
Reporter: Konstantin Shvachko
Assignee: Konstantin Shvachko
{{BlockManager.getBlocksWithLocations()}} needs to iterate blocks from a
randomly selected {{startBlock}} index. It creates an iterator which points to
the first block and then skips all blocks until {{startBlock}}. It is
inefficient when DN has multiple storages. Instead of skipping blocks one by
one we can skip entire storages. Should be more efficient on average.
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