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https://issues.apache.org/jira/browse/HDFS-17807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18033369#comment-18033369
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ASF GitHub Bot commented on HDFS-17807:
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github-actions[bot] closed pull request #7808: HDFS-17807. Support balanced
read distribution ordering in getBlockLocations()
URL: https://github.com/apache/hadoop/pull/7808
> Support balanced read distribution ordering in getBlockLocations()
> ------------------------------------------------------------------
>
> Key: HDFS-17807
> URL: https://issues.apache.org/jira/browse/HDFS-17807
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.10.0, 3.4.1
> Reporter: Rajan Dhabalia
> Priority: Major
> Labels: pull-request-available
>
> The current getBlockLocations method returns replica locations without
> considering the real-time load on individual DataNodes. This can lead to
> clients repeatedly selecting the same DataNode, particularly when network
> distance or rack locality remains unchanged. Since data locality isn’t always
> reliable due to various operational factors, the existing network
> topology–based ordering has not fully optimized performance and may
> inadvertently create load hotspots. so, replica ordering based on dynamic
> weight metric and specifically current read rate or read load will create
> more balanced read across the dataodes in a cluster.
> The policy is disabled by default and can be enabled to replace the current
> ordering mechanism, offering a more adaptive and performance-aware read path
> strategy.
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