Xiangrui Meng created SPARK-5254:
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             Summary: Update the user guide to make clear that spark.mllib is 
not being deprecated
                 Key: SPARK-5254
                 URL: https://issues.apache.org/jira/browse/SPARK-5254
             Project: Spark
          Issue Type: Documentation
            Reporter: Xiangrui Meng
            Assignee: Xiangrui Meng


The current statement in the user guide may deliver confusing messages to 
users. spark.ml contains high-level APIs for building ML pipelines. But it 
doesn't mean that spark.mllib is being deprecated.

First of all, the pipeline API is in its alpha stage and we need to see more 
use cases from the community to stabilizes it, which may take several releases. 
Secondly, the components in spark.ml are simple wrappers over spark.mllib 
implementations. Neither the APIs or the implementations from spark.mllib are 
being deprecated. We expect users use spark.ml pipeline APIs to build their ML 
pipelines, but we will keep supporting and adding features to spark.mllib. For 
example, there are many features in review at 
https://spark-prs.appspot.com/#mllib. So users should be comfortable with using 
spark.mllib features and expect more coming. The user guide needs to be updated 
to make the message clear.



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