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https://issues.apache.org/jira/browse/FLINK-7139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chesnay Schepler closed FLINK-7139.
-----------------------------------
    Resolution: Duplicate

It's a good idea in general but there's already an issue for this, see 
FLINK-4422.

> Refine currentTimeMillis to nanoTime
> ------------------------------------
>
>                 Key: FLINK-7139
>                 URL: https://issues.apache.org/jira/browse/FLINK-7139
>             Project: Flink
>          Issue Type: Improvement
>          Components: Local Runtime
>            Reporter: mingleizhang
>            Assignee: mingleizhang
>            Priority: Minor
>
> When measuring intervals of time it's much better & safer to use 
> {{System.nanoTime()}} than {{System.currentTimeMillis()}}. The latter is 
> affected by system clock drift and adjustments (like by system time daemon) 
> and the former is much more precise and stable.



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