vanzin commented on a change in pull request #26058: [SPARK-10614][core] Add
monotonic time to Clock interface.
URL: https://github.com/apache/spark/pull/26058#discussion_r332686468
##########
File path: core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala
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@@ -288,7 +288,7 @@ private[spark] class ExecutorAllocationManager(
}
// Update executor target number only after initializing flag is unset
- updateAndSyncNumExecutorsTarget(clock.getTimeMillis())
+ updateAndSyncNumExecutorsTarget(clock.nanoTime())
Review comment:
Are you sure about that?
This is what the javadocs say:
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.
(Comment about "other virtual machines" aside.)
That seems to be corroborated by other sources, too (e.g.
https://stackoverflow.com/questions/510462/is-system-nanotime-completely-useless).
Seems in a long gone past there might have been issues, but not today.
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