fanyunbojerry opened a new pull request #28389:
URL: https://github.com/apache/spark/pull/28389
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### What changes were proposed in this pull request?
Currently, bufferPoolsBySize in HeapMemoryAllocator uses a Map type whose
value type is LinkedList.
LinkedList is not thread safe and may hit the error below
```
java.util.NoSuchElementExceptionException
at java.util.LinkedList.removeFirst(LinkedList.java:270)
at java.util.LinkedList.remove(LinkedList.java:685)
at
org.apache.spark.unsafe.memory.HeapMemoryAllocator.allocate(HeapMemoryAllocator.java:57)
```
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