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https://issues.apache.org/jira/browse/SPARK-18487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15696458#comment-15696458
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Reynold Xin commented on SPARK-18487:
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As discussed on the pull request, this is not an issue.
> Add task completion listener to HashAggregate to avoid memory leak
> ------------------------------------------------------------------
>
> Key: SPARK-18487
> URL: https://issues.apache.org/jira/browse/SPARK-18487
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> The methods such as Dataset.show and take use Limit (CollectLimitExec) which
> leverages SparkPlan.executeTake to efficiently collect required number of
> elements back to the driver.
> However, under wholestage codege, we usually release resources after all
> elements are consumed (e.g., HashAggregate). In this case, we will not
> release the resources and cause memory leak with Dataset.show, for example.
> We can add task completion listener to HashAggregate to avoid the memory leak.
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