Github user 10110346 commented on the issue:

    https://github.com/apache/spark/pull/19077
  
    @jerryshao @JoshRosen yes, it would not generally be arbitrary sized 
allocations. Basically, we allocate memory in multiples of 4 or 8 bytes,even 
so, I think this change is also beneficial .
    Also,I think this change  will not  impact on the code which leverage it, 
because `MemoryBlock` is not changed


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