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Date: Wed, 1 Aug 2012 20:49:03 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <196707676.2120.1343854143330.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Created] (HDFS-3751) DN should log warnings for lengthy
 disk IOs
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Todd Lipcon created HDFS-3751:
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             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 1.2.3.4 took 61.3 seconds" or somesuch.

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