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https://issues.apache.org/jira/browse/SPARK-21270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070336#comment-16070336
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Sean Owen commented on SPARK-21270:
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How would Spark know how much of the total memory
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https://issues.apache.org/jira/browse/SPARK-21270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070264#comment-16070264
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jin xing commented on SPARK-21270:
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cc [~rxin] [~cloud_fan] [~joshrosen]
> Improvement
