Amit Sela updated BEAM-610:
    Fix Version/s: 0.3.0-incubating

> Enable spark's checkpointing mechanism for driver-failure recovery in 
> streaming
> -------------------------------------------------------------------------------
>                 Key: BEAM-610
>                 URL: https://issues.apache.org/jira/browse/BEAM-610
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>            Reporter: Amit Sela
>            Assignee: Amit Sela
>             Fix For: 0.3.0-incubating
> For streaming applications, Spark provides a checkpoint mechanism useful for 
> stateful processing and driver failures. See: 
> https://spark.apache.org/docs/1.6.2/streaming-programming-guide.html#checkpointing
> This requires the "lambdas", or the content of DStream/RDD functions to be 
> Serializable - currently, the runner a lot of the translation work in 
> streaming to the batch translator, which can no longer be the case because it 
> passes along non-serializables.
> This also requires wrapping the creation of the streaming application's graph 
> in a "getOrCreate" manner. See: 
> https://spark.apache.org/docs/1.6.2/streaming-programming-guide.html#how-to-configure-checkpointing
> Another limitation is the need to wrap Accumulators and Broadcast variables 
> in Singletons in order for them to be re-created once stale after recovery.
> This work is a prerequisite to support PerKey workflows, which will be 
> support via Spark's stateful operators such as mapWithState.   

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