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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7896) HDFS Slow disk detection
Date Fri, 06 Mar 2015 18:45:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14350697#comment-14350697

Chris Nauroth commented on HDFS-7896:

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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