Frederick Reiss commented on SPARK-16407:

It looks like there is a general agreement here that Structured Streaming ought 
to have some way to direct the output of a streaming query to the Spark driver. 
But there is a disagreement about what shape that API should take. Can we have 
a discussion on this thread about what would be an acceptable design to meet 
this requirement, or would it be better to move over to the dev list?

> Allow users to supply custom StreamSinkProviders
> ------------------------------------------------
>                 Key: SPARK-16407
>                 URL: https://issues.apache.org/jira/browse/SPARK-16407
>             Project: Spark
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: holdenk
> The current DataStreamWriter allows users to specify a class name as format, 
> however it could be easier for people to directly pass in a specific provider 
> instance - e.g. for user equivalent of ForeachSink or other sink with 
> non-string parameters.

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