Chris Nauroth created HDFS-6236:
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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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