Github user wilson888888888 commented on a diff in the pull request: https://github.com/apache/spark/pull/11580#discussion_r55933241 --- Diff: core/src/test/scala/org/apache/spark/ContextCleanerSuite.scala --- @@ -442,25 +442,25 @@ class CleanerTester( checkpointIds: Seq[Long] = Seq.empty) extends Logging { - val toBeCleanedRDDIds = new HashSet[Int] with SynchronizedSet[Int] ++= rddIds - val toBeCleanedShuffleIds = new HashSet[Int] with SynchronizedSet[Int] ++= shuffleIds - val toBeCleanedBroadcstIds = new HashSet[Long] with SynchronizedSet[Long] ++= broadcastIds - val toBeCheckpointIds = new HashSet[Long] with SynchronizedSet[Long] ++= checkpointIds + val toBeCleanedRDDIds = new HashSet[Int] ++= rddIds --- End diff -- @srowen I tried to change to val toBeCleanedRDDIds = HashSet(rddIds), but I got error at toBeCleanedRDDIds -= rddId so I will keep val toBeCleanedRDDIds = new HashSet[Int] ++= rddIds
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