Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5548#discussion_r28586982
  
    --- Diff: core/src/test/scala/org/apache/spark/ContextCleanerSuite.scala ---
    @@ -427,12 +429,17 @@ class CleanerTester(
     
         def broadcastCleaned(broadcastId: Long): Unit = {
           toBeCleanedBroadcstIds -= broadcastId
    -      logInfo("Broadcast" + broadcastId + " cleaned")
    +      logInfo("Broadcast " + broadcastId + " cleaned")
         }
     
         def accumCleaned(accId: Long): Unit = {
           logInfo("Cleaned accId " + accId + " cleaned")
         }
    +
    +    def checkpointCleaned(rddId: Long): Unit = {
    +      toBeCheckpointIds -= rddId
    --- End diff --
    
    Great, that's a good explanation. I see that this makes it effectively wait 
longer to proceed, by which time some necessary conditions are true, like that 
checkpoint cleanup has happened. Thank you for that detail, and to the limits 
of my knowledge, this looks good.


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