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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3343) Improve metrics for DN read latency
Date Tue, 01 May 2012 23:02:54 GMT
Todd Lipcon created HDFS-3343:
---------------------------------

             Summary: Improve metrics for DN read latency
                 Key: HDFS-3343
                 URL: https://issues.apache.org/jira/browse/HDFS-3343
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
            Reporter: Todd Lipcon


Similar to HDFS-3170 on the write side, we should improve the metrics that are generated on
the DN for read latency. We should have separate metrics for the time spent in {{transferTo}}
vs {{waitWritable}} so that it's easy to distinguish slow local disks from slow readers on
the other end of the socket.

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