Formally, Beam is not yet supported by Dataflow (although this is certainly what we are aiming for). We recommend that you stay in the Dataflow SDK, especially if SLA or support is important to you. that our tests show that Beam works in Dataflow, and although it can break at any time, you can certainly try at your own risk.
Update: The Dataflow SDKs are now Beam-based since the release of the Dataflow SDK 2.0 ( https://cloud.google.com/dataflow/release-notes/release-notes-java-2 ). Both Beam and the Dataflow SDK in Cloud Dataflow are currently supported.
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