Jean-Baptiste Onofré resolved BEAM-918.
       Resolution: Fixed
    Fix Version/s: 0.4.0-incubating

> Let users set STORAGE_LEVEL via SparkPipelineOptions.
> -----------------------------------------------------
>                 Key: BEAM-918
>                 URL: https://issues.apache.org/jira/browse/BEAM-918
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-spark
>            Reporter: Amit Sela
>            Assignee: Jean-Baptiste Onofré
>             Fix For: 0.4.0-incubating
> Spark provides different "STORAGE_LEVEL"s for caching RDDs (disk, memory, 
> ser/de, etc.).
> The runner decides on caching when necessary, for example when a RDD is 
> accessed repeatedly.
> For batch, we can let users set their preferred STORAGE_LEVEL via 
> SparkPipelineOptions.
> Note: for streaming we force a "MEMORY_ONLY", since (among other things) the 
> runner heavily relies on stateful operations, and it's natural for streaming 
> to happen in memory.

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