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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3751) DN should log warnings for lengthy disk IOs
Date Wed, 01 Aug 2012 20:49:03 GMT
Todd Lipcon created HDFS-3751:

             Summary: 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: Todd Lipcon

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 took 61.3 seconds" or somesuch.

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