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https://issues.apache.org/jira/browse/SPARK-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183643#comment-14183643
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Apache Spark commented on SPARK-4084:
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User 'mengxr' has created a pull request for this issue:
https://github.com/apache/spark/pull/2937
> Reuse sort key in Sorter
> ------------------------
>
> Key: SPARK-4084
> URL: https://issues.apache.org/jira/browse/SPARK-4084
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
>
> Sorter uses generic-typed key for sorting. When data is large, it creates
> lots of key objects, which is not efficient. We should reuse the key in
> Sorter for memory efficiency. This change is part of the petabyte sort
> implementation from [~rxin].
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