Github user lw-lin commented on a diff in the pull request: https://github.com/apache/spark/pull/15497#discussion_r83570798 --- Diff: core/src/main/scala/org/apache/spark/util/ManualClock.scala --- @@ -27,6 +27,7 @@ package org.apache.spark.util private[spark] class ManualClock(private var time: Long) extends Clock { private var _isWaiting = false + private var _readyForFirstPeek = false --- End diff -- `_isWaiting` indicates the main `StreamExecution` thread is waiting, while `_readyForFirstPeek` is supposed to indicate whether it's **the first time** the **test thread** knows about the main thread is waiting. When it's a second time or a third time the test thread knows the main thread is waiting via `isWaitingAndReadyForFirstPeek()`, the test thread itself should block to prevent `advance()`ing too early.
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