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https://issues.apache.org/jira/browse/HADOOP-14713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16109453#comment-16109453
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Jason Lowe commented on HADOOP-14713:
-------------------------------------
This arose from discussion in HADOOP-14669. If there ends up being a lot of
places that need to be fixed then this can serve as an umbrella ticket for the
subtasks.
> Audit for durations that should be measured via Time.monotonicNow
> -----------------------------------------------------------------
>
> Key: HADOOP-14713
> URL: https://issues.apache.org/jira/browse/HADOOP-14713
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jason Lowe
>
> Whenever we are measuring a time delta or duration in the same process, the
> timestamps probably should be using Time.monotonicNow rather than Time.now or
> System.currentTimeMillis. The latter two are directly reading the system
> clock which can move faster or slower than actual time if the system is
> undergoing a time adjustment (e.g.: adjtime or admin sets a new system time).
> We should go through the code base and identify places where the code is
> using the system clock but really should be using monotonic time.
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