[jira] [Resolved] (SPARK-14966) SizeEstimator should ignore classes in the scala.reflect package

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin resolved SPARK-14966.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.0.0

> 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
>             Fix For: 2.0.0
>
>
> 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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