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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