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https://issues.apache.org/jira/browse/HDFS-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350697#comment-14350697
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Chris Nauroth commented on HDFS-7896:
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bq. Chris Nauroth recently added failed volume reporting via HDFS-7604. Ideally
we can extend that reporting infrastructure.
Yes, I think that will work. We can add slow disk information to the
{{VolumeFailureSummaryProto}} message. That will ride along in heartbeats, and
we can add corresponding metrics and web UI fields.
> 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
>
> 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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