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https://issues.apache.org/jira/browse/SPARK-14966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260882#comment-15260882
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Apache Spark commented on SPARK-14966:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/12741
> SizeEstimator should ignore classes in the scala.reflect package
> ----------------------------------------------------------------
>
> Key: SPARK-14966
> URL: https://issues.apache.org/jira/browse/SPARK-14966
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> In local benchmarks, I noticed SizeEstimator spending tons of time estimating
> the size of objects which contain TypeTag or ClassTag fields. The problem
> with these tags is that they reference global Scala reflection objects,
> which, in turn, reference many singletons, such as TestHive. This throws off
> the size estimation and wastes tons of time traversing the huge object graph.
> As a result, I think that SizeEstimator should ignore any classes in the
> {{scala.reflect}} package.
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