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https://issues.apache.org/jira/browse/SPARK-12060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032769#comment-15032769
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Apache Spark commented on SPARK-12060:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/10051
> Avoid memory copy in JavaSerializerInstance.serialize
> -----------------------------------------------------
>
> Key: SPARK-12060
> URL: https://issues.apache.org/jira/browse/SPARK-12060
> Project: Spark
> Issue Type: Improvement
> Reporter: Shixiong Zhu
>
> JavaSerializerInstance.serialize uses ByteArrayOutputStream.toByteArray to
> get the serialized data. ByteArrayOutputStream.toByteArray needs to copy the
> content in the internal array to a new array. However, since the array will
> be converted to ByteBuffer at once, we can avoid the memory copy.
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