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https://issues.apache.org/jira/browse/SPARK-3600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng updated SPARK-3600:
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Description: RDD's classTag is not passed in through CacheManager. So
RDD[Double] uses object arrays for caching, which leads to huge overhead.
However, we need to send the classTag down many levels to make it work. (was:
RandomDataGenerator doesn't have a classTag or @specilaized. So the generated
RDDs are RDDs of objects, that cause huge storage overhead.)
> RDD[Double] doesn't use primitive arrays for caching
> ----------------------------------------------------
>
> Key: SPARK-3600
> URL: https://issues.apache.org/jira/browse/SPARK-3600
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.1.0
> Reporter: Xiangrui Meng
> Assignee: Xiangrui Meng
>
> RDD's classTag is not passed in through CacheManager. So RDD[Double] uses
> object arrays for caching, which leads to huge overhead. However, we need to
> send the classTag down many levels to make it work.
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