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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11634) Optimize BlockIterator when interating starts in the middle.
Date Mon, 17 Apr 2017 07:18:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15970761#comment-15970761
] 

Zhe Zhang commented on HDFS-11634:
----------------------------------

Thanks Konstantin for updating the patch.

v5 patch LGTM. +1. Nice optimization!

> 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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