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https://issues.apache.org/jira/browse/SPARK-17822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713646#comment-15713646
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Joseph K. Bradley commented on SPARK-17822:
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Since 2.1 is underway and this is not a regression, I'll shift the target.

> JVMObjectTracker.objMap may leak JVM objects
> --------------------------------------------
>
>                 Key: SPARK-17822
>                 URL: https://issues.apache.org/jira/browse/SPARK-17822
>             Project: Spark
>          Issue Type: Bug
>          Components: SparkR
>            Reporter: Yin Huai
>         Attachments: screenshot-1.png
>
>
> JVMObjectTracker.objMap is used to track JVM objects for SparkR. However, we 
> observed that JVM objects that are not used anymore are still trapped in this 
> map, which prevents those object get GCed. 
> Seems it makes sense to use weak reference (like persistentRdds in 
> SparkContext). 



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