[GitHub] [beam] kennknowles opened a new issue, #19343: Behavior requires documentation: Pipeline can't run before fusion

[GitBox <gi...@apache.org>]

kennknowles opened a new issue, #19343:
URL: https://github.com/apache/beam/issues/19343

   When I was prototyping a portable runner, I tested using a trivial pipeline:
   ```
   
   PCollection<byte[]> result = pipeline.apply("impulse", Impulse.create());
   PAssert.thatSingleton(result).isEqualTo(new
   byte[]{});
   
   ```
   
   When I tried traversing this pipeline, I found that the URN for the transform PAssert$0 was strangely missing. Turns out GreedyPipelineFuser solves this problem. I don't know why this is so, but I think this behavior should at least be documented in the [runner authoring guide](https://beam.apache.org/contribute/runner-guide/#pipeline) to save future runner authors some debugging.
   
   Imported from Jira [BEAM-6762](https://issues.apache.org/jira/browse/BEAM-6762). Original Jira may contain additional context.
   Reported by: ibzib.


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