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From "Yong Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7896) HDFS Slow disk detection
Date Fri, 13 Mar 2015 07:44:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14360063#comment-14360063
] 

Yong Zhang commented on HDFS-7896:
----------------------------------

If user put all slow disk only for ARCHIVE storage, it means no many users access these data
on disk, how to meet this case?

> 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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