Github user Ngone51 commented on the issue:
https://github.com/apache/spark/pull/20676
Hi, @ConeyLiu. I don't think it's about compatibility. Because both
```StaticMemoryManager``` and ```UnifiedMemoryManager``` call the same function
for release unroll memory, which is ```releaseUnrollMemory()```,
see[https://github.com/apache/spark/blob/b14993e1fcb68e1c946a671c6048605ab4afdf58/core/src/main/scala/org/apache/spark/memory/MemoryManager.scala#L165](url)
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