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https://issues.apache.org/jira/browse/SPARK-21860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-21860.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.4.0
Issue resolved by pull request 19077
[https://github.com/apache/spark/pull/19077]
> 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 sameļ¼because we allocate memory in multiples of 8
> bytes.
> In this case, we can improve memory reuse.
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