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https://issues.apache.org/jira/browse/HDFS-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15963055#comment-15963055
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Rushabh S Shah commented on HDFS-11634:
---------------------------------------
Overall the patch looks good.
But I have one question.
In the patch , should the line {{if(numBlocks < s) {}} be {{if(numBlocks '<='
s) {}} ?
{noformat}
if(numBlocks < s) {
index++;
s -= numBlocks;
}
{noformat}
> 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
>
>
> {{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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