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https://issues.apache.org/jira/browse/HDFS-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969642#comment-15969642
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Rushabh S Shah commented on HDFS-11634:
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bq. I don't think we need to optimize the circular jump. Do you?
No. It was just a thought.
It is no more worse than what is today.
Just to clarify, I don't have any objections to the latest version of the
patch.
+1 non-binding.
> 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
> Attachments: HDFS-11634.001.patch, HDFS-11634.002.patch,
> HDFS-11634.003.patch, HDFS-11634.004.patch, HDFS-11643.005.patch
>
>
> {{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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