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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6236) ImageServlet should use Time#monotonicNow to measure latency.
Date Sat, 12 Apr 2014 00:12:14 GMT
Chris Nauroth created HDFS-6236:
-----------------------------------

             Summary: ImageServlet should use Time#monotonicNow to measure latency.
                 Key: HDFS-6236
                 URL: https://issues.apache.org/jira/browse/HDFS-6236
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.4.0, 3.0.0
            Reporter: Chris Nauroth
            Assignee: Chris Nauroth
            Priority: Minor


{{ImageServlet}} currently uses {{Time#now}} to get file transfer latency measurements and
pass them to the metrics system.  It would be preferrable to use {{Time#monotonicNow}} so
that we're using the most precise available system timer, and we're not subject to odd bugs
that could result in negative latency measurements, like resetting the system clock.



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