Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/8541#issuecomment-140240766
@feynmanliang I think it is (sort of), so
nodeIdsForInstances.persist(StorageLevel.MEMORY_AND_DISK) and then eventually
prevNodeIdsForInstances is set to this and nodeIdsForInstances is updated. (So
there isn't an explicit cache call on something with that name but it totally
is set to an RDD we want to unpersist). Or at least thats what I remember from
reading through the code/JIRA (could have been off though)
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