Github user szhem commented on the issue: https://github.com/apache/spark/pull/19410 I've tested the mentioned checkpointers with `spark.cleaner.referenceTracking.cleanCheckpoints` set to `true` and without explicit checkpoint files removal. It seems that there are somewhere hard references remained - old checkpoint files are not deleted at all and it seems that ContextCleaner.doCleanCheckpoint is never called.
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