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https://issues.apache.org/jira/browse/SPARK-4844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14246738#comment-14246738
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Guoqiang Li commented on SPARK-4844:
------------------------------------

The main reason is that {{RDD.sample}} is not efficient.  {{RDD.sample}} loads 
all data into memory.
See https://github.com/witgo/spark/compare/SPARK-4844 

> SGD should support custom sampling.
> -----------------------------------
>
>                 Key: SPARK-4844
>                 URL: https://issues.apache.org/jira/browse/SPARK-4844
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Guoqiang Li
>             Fix For: 1.3.0
>
>




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