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https://issues.apache.org/jira/browse/SPARK-23404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361933#comment-16361933
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Apache Spark commented on SPARK-23404:
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User '10110346' has created a pull request for this issue:
https://github.com/apache/spark/pull/20596

> When the underlying buffers are already direct, we should copy them to the 
> heap memory
> --------------------------------------------------------------------------------------
>
>                 Key: SPARK-23404
>                 URL: https://issues.apache.org/jira/browse/SPARK-23404
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: liuxian
>            Priority: Minor
>
> If the memory mode is _ON_HEAP_,when the underlying buffers are direct, we 
> should copy them to the heap memory.



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