liuxian created SPARK-23404:
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Summary: When the underlying buffers are already direct, we should
copy it 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
If the memory mode is _ON_HEAP_,when the underlying buffers are direct, we
should copy it to the heap memory.
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