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https://issues.apache.org/jira/browse/SPARK-2603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068093#comment-14068093
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Apache Spark commented on SPARK-2603:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/1504
> Remove unnecessary toMap and toList in converting Java collections to Scala
> collections JsonRDD.scala
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-2603
> URL: https://issues.apache.org/jira/browse/SPARK-2603
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
> Priority: Minor
>
> In JsonRDD.scalafy, we are using toMap/toList to convert a Java Map/List to a
> Scala one. These two operations are pretty expensive because they read
> elements from a Java Map/List and then load to a Scala Map/List. We can use
> Scala wrappers to wrap those Java collections instead of using toMap/toList.
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