Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14223#discussion_r71071394
--- Diff: core/src/main/scala/org/apache/spark/util/Clock.scala ---
@@ -17,11 +17,21 @@
package org.apache.spark.util
+import java.util.concurrent.TimeUnit
+
/**
* 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
+
+ /**
+ * Wait until a clock's view of current time reaches the specified
target time.
+ *
+ * @param targetTime block until the current time is at least this value
+ * @return clock's view of current time when the wait has completed
+ */
def waitTillTime(targetTime: Long): Long
--- End diff --
what's the unit?
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