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https://issues.apache.org/jira/browse/FLINK-4422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136194#comment-16136194
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Hai Zhou commented on FLINK-4422:
---------------------------------

Hi [~StephanEwen], This is still a issue?
If yes, I would like to work on this issue.
Use the methods provided by 
[https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/util/clock/SystemClock.java]
 to replace the time measurement code, such as relative / intervals.

> Convert all time interval measurements to System.nanoTime()
> -----------------------------------------------------------
>
>                 Key: FLINK-4422
>                 URL: https://issues.apache.org/jira/browse/FLINK-4422
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Stephan Ewen
>            Assignee: Jin Mingjian
>            Priority: Minor
>
> In contrast to {{System.currentTimeMillis()}}, {{System.nanoTime()}} is 
> monotonous. To measure delays and time intervals, {{System.nanoTime()}} is 
> hence reliable, while {{System.currentTimeMillis()}} is not.



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