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https://issues.apache.org/jira/browse/SPARK-12729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15153483#comment-15153483
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Apache Spark commented on SPARK-12729:
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User 'GayathriMurali' has created a pull request for this issue:
https://github.com/apache/spark/pull/11257
> phantom references to replace the finalize call in python broadcast
> -------------------------------------------------------------------
>
> Key: SPARK-12729
> URL: https://issues.apache.org/jira/browse/SPARK-12729
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Reporter: Davies Liu
>
> it is doing IO operations and blocking the GC thread,
> see
> http://resources.ej-technologies.com/jprofiler/help/doc/index.html#jprofiler.helptopics.cpu.finalizers
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