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https://issues.apache.org/jira/browse/BEAM-6762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547606#comment-17547606
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Kenneth Knowles commented on BEAM-6762:
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This issue has been migrated to https://github.com/apache/beam/issues/19343
> Behavior requires documentation: Pipeline can't run before fusion
> -----------------------------------------------------------------
>
> Key: BEAM-6762
> URL: https://issues.apache.org/jira/browse/BEAM-6762
> Project: Beam
> Issue Type: Task
> Components: runner-core
> Reporter: Kyle Weaver
> Priority: P3
> Labels: documentation
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> When I was prototyping a portable runner, I tested using a trivial pipeline:
> {noformat}
> PCollection<byte[]> result = pipeline.apply("impulse", Impulse.create());
> PAssert.thatSingleton(result).isEqualTo(new byte[]{});
> {noformat}
> 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.
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