[jira] [Created] (FLINK-4422) Convert all time interval measurements to System.nanoTime()

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-4422:
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             Summary: 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
            Reporter: Stephan Ewen
            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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