holdenk commented on SPARK-16407:

I'm not sure I understand - this really isn't exposing a new sink interface - 
it just gives people a different way of specifying sinks that they currently 
have to do using a string (which can point to a custom user sink - but the old 
API prevents dynamic user sinks).

> 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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