[BEAM-2007] DataflowRunner drops Reads with no consumers

• Type: Bug
• Status: In Progress
• Priority: P3
• Resolution: Unresolved
• Component/s: runner-dataflow, sdk-py-core
• Assignee: Unassigned
• Reporter: Dan Halperin
• Created: 18/Apr/17 22:51
• Updated: 03/Jun/22 17:29

Description

Basically, if a pipeline has "just" a Read with no consumers, the optimizer in Dataflow will drop it. To preserve Beam semantics, we do want to run the Read and drop its output, e.g., because the Read may have side effects that we're testing for.

Is it possible with pipeline surgery to find such Reads and add an Identity ParDo to them?

Issue Links

• links to: GitHub Pull Request #2587