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https://issues.apache.org/jira/browse/HDFS-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14970111#comment-14970111
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Arpit Agarwal commented on HDFS-7896:
-------------------------------------
Also you could see if you want to surface this information to administrators
via the HDFS-7604 framework. That can be done in a separate Jira too.
> HDFS Slow disk detection
> ------------------------
>
> Key: HDFS-7896
> URL: https://issues.apache.org/jira/browse/HDFS-7896
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Arpit Agarwal
> Attachments: HDFS-7896.00.patch
>
>
> HDFS should detect slow disks. To start with we can flag this information via
> the NameNode web UI. Alternatively DNs can avoid using slow disks for writes.
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