Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/15497#discussion_r83568018 --- 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 -- Its really not obvious on what purpose does _readyForFirstPeek server over _isWaiting.
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