Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/14223
> This method can only be used to measure elapsed time and is not related
to any other notion of system or wall-clock time. The value returned represents
nanoseconds since some fixed but arbitrary origin time (perhaps in the future,
so values may be negative). The same origin is used by all invocations of this
method in an instance of a Java virtual machine; other virtual machine
instances are likely to use a different origin.
As per javadoc, `System.nanoTime` cannot be used to get the current system
time. I saw most of places just use `getTimeMillis` to get the current system
time and display it on UI. I don't think we can change it to `System.nanoTime`.
@markgrover could you close this pr, please?
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