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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4169) Add per-disk latency metrics to DataNode
Date Sat, 10 Nov 2012 13:25:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4169?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494682#comment-13494682
] 

Allen Wittenauer commented on HDFS-4169:
----------------------------------------

This is definitely a good thing and something we've needed for a long time now. We need to
tread carefully if we decide to act on the metrics we get back however, as latency may occur
just due to the basic multi-tenant nature of Hadoop.
                
> Add per-disk latency metrics to DataNode
> ----------------------------------------
>
>                 Key: HDFS-4169
>                 URL: https://issues.apache.org/jira/browse/HDFS-4169
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 3.0.0
>            Reporter: Todd Lipcon
>
> Currently, if one of the drives on the DataNode is slow, it's hard to determine what
the issue is. This can happen due to a failing disk, bad controller, etc. It would be preferable
to expose per-drive MXBeans (or tagged metrics) with latency statistics about how long reads/writes
are taking.

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