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From "Daniel Halperin (JIRA)" <>
Subject [jira] [Updated] (BEAM-2007) DataflowRunner drops Reads with no consumers
Date Wed, 19 Apr 2017 17:55:41 GMT


Daniel Halperin updated BEAM-2007:
    Component/s: sdk-py

> DataflowRunner drops Reads with no consumers
> --------------------------------------------
>                 Key: BEAM-2007
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-dataflow, sdk-py
>            Reporter: Daniel Halperin
>             Fix For: First stable release
> 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

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