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https://issues.apache.org/jira/browse/FLINK-4421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17194158#comment-17194158
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Andrey Zagrebin commented on FLINK-4421:
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We already have the Clock interface but its SystemClock implementation does not
freeze the time to make it monotonous (see FLINK-4423).
I believe we still need the monitonous implementation of currentTimeMillis for
wall-clock time because nanoTime cannot be used as wall-clock time, only for
intervals.
> Make clocks and time measurements monotonous
> --------------------------------------------
>
> Key: FLINK-4421
> URL: https://issues.apache.org/jira/browse/FLINK-4421
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Coordination
> Reporter: Stephan Ewen
> Priority: Minor
>
> Currently, many places use {{System.currentTimeMillis()}} to acquire
> timestamps or measure time intervals.
> Since this relies on the system clock, and the system clock is not
> necessarily monotonous (in the presence of clock updates), this can lead to
> negative duration and decreasing timestamps where increasing timestamps are
> expected.
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