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https://issues.apache.org/jira/browse/HDFS-6236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Nauroth updated HDFS-6236:
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Status: Patch Available (was: Open)
> 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
> Attachments: HDFS-6236.1.patch
>
>
> {{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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