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https://issues.apache.org/jira/browse/HDFS-3751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13656728#comment-13656728
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Matt Foley commented on HDFS-3751:
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Changed Target Version to 1.3.0 upon release of 1.2.0. Please change to 1.2.1
if you intend to submit a fix for branch-1.2.
> 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: datanode
> Affects Versions: 1.2.0, 2.0.0-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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