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https://issues.apache.org/jira/browse/SPARK-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14080184#comment-14080184
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Apache Spark commented on SPARK-2758:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/1675
> UnionRDD's UnionPartition should not reference parent RDDs
> ----------------------------------------------------------
>
> Key: SPARK-2758
> URL: https://issues.apache.org/jira/browse/SPARK-2758
> Project: Spark
> Issue Type: Improvement
> Affects Versions: 1.0.0, 1.0.1, 1.0.2
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> UnionPartition has a non-transient field referencing the parent RDD, to be
> used in compute (iterator). That causes some trouble with task size because
> partition objects are supposed to be small.
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