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https://issues.apache.org/jira/browse/HDFS-17890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18082927#comment-18082927
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ASF GitHub Bot commented on HDFS-17890:
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steveloughran commented on PR #8338:
URL: https://github.com/apache/hadoop/pull/8338#issuecomment-4520820570
HDFS internals is not my area of expertise, and I don't like reviewing stuff
there. Best to ask on the hdfs developer list for reviewers
> Avoid slow disks datanode when reading data
> -------------------------------------------
>
> Key: HDFS-17890
> URL: https://issues.apache.org/jira/browse/HDFS-17890
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Reporter: JunJieZhao
> Priority: Major
> Labels: pull-request-available
>
> During HDFS read operations, replicas on slow disks should be deprioritized
> so that replicas on healthy disks are preferred.
> Currently, slow disk avoidance is not performed at the disk level when
> reading operations return to the block position.
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