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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-3751) DN should log warnings for lengthy disk IOs
Date Thu, 02 Aug 2012 00:34:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe reassigned HDFS-3751:
------------------------------------------

    Assignee: Colin Patrick McCabe  (was: Todd Lipcon)
    
> DN should log warnings for lengthy disk IOs
> -------------------------------------------
>
>                 Key: HDFS-3751
>                 URL: https://issues.apache.org/jira/browse/HDFS-3751
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 1.2.0, 2.1.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Colin Patrick McCabe
>
> Occasionally failing disks or other OS-and-below issues cause a single IO to take tens
of seconds, or even minutes in the case of failures. This often results in timeout exceptions
at the client side which are hard to diagnose. It would be easier to root-cause these issues
if the DN logged a WARN like "IO of 64kb to volume /data/1/dfs/dn for block 12345234 client
1.2.3.4 took 61.3 seconds" or somesuch.

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