mingleizhang created FLINK-7139:
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             Summary: 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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