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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