Amit Sela created BEAM-649:

             Summary: Pipeline "actions" should use foreachRDD via ParDo.
                 Key: BEAM-649
             Project: Beam
          Issue Type: Bug
          Components: runner-spark
            Reporter: Amit Sela
            Assignee: Amit Sela

Spark will execute a pipeline ONLY if it's triggered by an action (batch) / 
output operation (streaming) -

Currently, such actions in Beam are mostly implemented via ParDo, and 
translated by the runner as a Map transformation (via mapPartitions).

The runner overcomes this by "forcing" actions on untranslated leaves.
While this is OK, it would be better in some cases, e.g., Sinks, to apply the 
same ParDo translation but with foreach/foreachRDD instead of 

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