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[#23106] Add periodic.Sequence and periodic.Impulse transforms to Go SDK #25808
[#23106] Add periodic.Sequence and periodic.Impulse transforms to Go SDK #25808
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We should be able to add a short unit test if using the
prism
runner directly.While the runner isn't fully complete yet, it does run and execute ProcessContinuation transforms and watermarks!
It just doesn't do the splitting just yet, or actually "wait" for any process continuations at the moment. But when the "sequence" is done, it will terminate, so we can add a test with period of a second, a duration of a minute, and then count that we're getting 60 elements out of the transform. (Small risk of getting 59 instead, as a flake...)
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That's great! I couldn't get it working on the direct runner, but didn't try using the new prism explicitly. Have now added two tests
TestImpulse
andTestSequence
and it looks like that's working. Let me know what you think.There was a problem hiding this comment.
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The direct runner (and basically all non-portable runners), are not great, since they mis-align expectations for users when they move to executing on a "real" runner, like Flink or Dataflow. There's also no "spec" about what a Direct Runner should do to properly test things, so the Go Direct Runner is missing a number of features that the Java and Python ones use.
Essentially Prism is going to replace the Go Direct Runner as the default runner for the Go SDK at least, and hopefully make testing and local runs for all facets of Beam easier. The prism Readme has a bunch of the vision, and desired goals, but I gave a talk at last year's Beam Summit, about the motivations, especially in all the "hidden" bits of beam that users usually don't interact with, but are affected by.
https://www.youtube.com/watch?v=G4lbkvAG6xk