[GitHub] spark pull request #14223: [SPARK-10614][CORE] Change SystemClock to derive ...

[rxin <gi...@git.apache.org>]

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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