Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8766#discussion_r39536569
--- Diff: core/src/main/scala/org/apache/spark/util/Clock.scala ---
@@ -21,12 +21,22 @@ package org.apache.spark.util
* An interface to represent clocks, so that they can be mocked out in
unit tests.
*/
private[spark] trait Clock {
+
+ /**
+ * @return the time in milliseconds
+ */
def getTimeMillis(): Long
+
+ /**
+ * @param targetTime block until the current time is at least this value
+ * @return current system time when wait has completed
--- End diff --
Not system time, right? Just the clock's view of current time.
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