Github user michaelmior commented on the issue:
https://github.com/apache/spark/pull/12162
As best I can tell, the code that was pushed here is incomplete. However,
Spark's default cache eviction policy is LRU. You can find the code which
performs eviction
[here](https://github.com/apache/spark/blob/1e82335413bc2384073ead0d6d581c862036d0f5/core/src/main/scala/org/apache/spark/storage/memory/MemoryStore.scala#L501).
It basically just works by storing all the data in a `LinkedHashMap`
configured to track which elements were accessed most recently.
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