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https://issues.apache.org/jira/browse/SPARK-13573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174726#comment-15174726
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Sun Rui commented on SPARK-13573:
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[~chipsenkbeil] glad to know Toree is to support SparkR. I tried it and can't 
figure out how to interact with SparkR. Could you describe how Toree uses the 
methods to provide interaction with SparkR?

> Open SparkR APIs (R package) to allow better 3rd party usage
> ------------------------------------------------------------
>
>                 Key: SPARK-13573
>                 URL: https://issues.apache.org/jira/browse/SPARK-13573
>             Project: Spark
>          Issue Type: Improvement
>          Components: SparkR
>            Reporter: Chip Senkbeil
>
> Currently, SparkR's R package does not expose enough of its APIs to be used 
> flexibly. That I am aware of, SparkR still requires you to create a new 
> SparkContext by invoking the sparkR.init method (so you cannot connect to a 
> running one) and there is no way to invoke custom Java methods using the 
> exposed SparkR API (unlike PySpark).
> We currently maintain a fork of SparkR that is used to power the R 
> implementation of Apache Toree, which is a gateway to use Apache Spark. This 
> fork provides a connect method (to use an existing Spark Context), exposes 
> needed methods like invokeJava (to be able to communicate with our JVM to 
> retrieve code to run, etc), and uses reflection to access 
> org.apache.spark.api.r.RBackend.
> Here is the documentation I recorded regarding changes we need to enable 
> SparkR as an option for Apache Toree: 
> https://github.com/apache/incubator-toree/tree/master/sparkr-interpreter/src/main/resources



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