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https://issues.apache.org/jira/browse/HDFS-17743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17934353#comment-17934353
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ASF GitHub Bot commented on HDFS-17743:
---------------------------------------
weisong44 opened a new pull request, #7498:
URL: https://github.com/apache/hadoop/pull/7498
Added support for random datanode ordering in getBlockLocations() and put it
behind a configuration parameter with the default behavior remaining unchanged.
(cherry picked from commit ef9043fcc001d3f2c9a6209d21011ac44207970c)
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### Description of PR
### How was this patch tested?
### For code changes:
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> Support random datanode ordering in getBlockLocations()
> -------------------------------------------------------
>
> Key: HDFS-17743
> URL: https://issues.apache.org/jira/browse/HDFS-17743
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.10.0, 3.4.1
> Reporter: Wei Song
> Priority: Major
> Labels: pull-request-available
>
> At LinkedIn, we aren't able to rely on data locality due to various reasons,
> overall the current implementation of sorting by network topology didn't
> improve overall performance, it also caused unnecessary concentration of load
> on specific datanodes. We would like to request for a random policy that
> randomly order datanodes, we expect this policy to improve load distribution.
>
> The new policy should be configurable, and it is disabled. When enabled, it
> replaces the current network topology based datanode ordering.
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