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https://issues.apache.org/jira/browse/SPARK-21860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358114#comment-16358114
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Apache Spark commented on SPARK-21860:
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User 'mgaido91' has created a pull request for this issue:
https://github.com/apache/spark/pull/20558

> Improve memory reuse for heap memory in `HeapMemoryAllocator`
> -------------------------------------------------------------
>
>                 Key: SPARK-21860
>                 URL: https://issues.apache.org/jira/browse/SPARK-21860
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: liuxian
>            Assignee: liuxian
>            Priority: Minor
>             Fix For: 2.4.0
>
>
> In `HeapMemoryAllocator`, when allocating memory from pool,  and the key of 
> pool is memory size.
> Actually  some size of memory ,such as 1025bytes,1026bytes,......1032bytes,  
> we can think they are the sameļ¼Œbecause we allocate memory in multiples of 8 
> bytes.
> In this case, we can improve memory reuse.



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