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https://issues.apache.org/jira/browse/BEAM-6762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16782199#comment-16782199
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Kyle Weaver edited comment on BEAM-6762 at 3/1/19 11:26 PM:
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Also, if I'm understanding correctly that fusion is strictly required to run a
pipeline, that behavior could be made more explicit in the code, maybe by
making a
[PortablePipelineRunner|https://github.com/apache/beam/blob/master/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/jobsubmission/PortablePipelineRunner.java]
provide a fuse function?
was (Author: ibzib):
Also, if I'm understanding correctly that fusion is strictly required to run a
pipeline, that behavior could be made more explicit in the code, maybe by
making a
[PortablePipelineRunner|https://github.com/apache/beam/blob/master/runners/java-fn-execution/src/main/java/org/apache/beam/runners/fnexecution/jobsubmission/PortablePipelineRunner.java]
implement a fuse function?
> 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: Minor
> Labels: documentation
>
> 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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