Hi:

        Thank you for your response. I want to know how this component 
communicate with each other. So, RscDriver communicate with Spark Driver 
through RPC? Right? 
        Is there a protocol between RscClient and RscDriver?


Thanks
Wandong

> On Jul 17, 2018, at 08:49, Meisam Fathi <meisam.fa...@gmail.com> wrote:
> 
> 
> Within an interactive session, Livy communicate with Spark through RPC. 
> According to some architecture diagrams, LivyServer has a RscClient, and 
> Spark has a RscDriver. My understanding is that RscDriver is one of 
> components belonging to Spark, and RscDriver has existed before the Livy 
> project was created. Is that right? 
> 
> No. RscDriver and RscClient are both part of Livy. RscDriver starts the Spark 
> Driver. RscDriver stars a Spark context, gets the statements from RscClient, 
> runs them on SparkContext, and returns the results to RscClient.
>  
> 
> Thanks,
> Meisam

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