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ASF GitHub Bot logged work on BEAM-3304:
----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Mar/22 19:37
Start Date: 09/Mar/22 19:37
Worklog Time Spent: 10m
Work Description: codecov[bot] edited a comment on pull request #17047:
URL: https://github.com/apache/beam/pull/17047#issuecomment-1062245938
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@@ Coverage Diff @@
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Lines 87406 87406
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+ Misses 21831 21826 -5
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Issue Time Tracking
-------------------
Worklog Id: (was: 739043)
Time Spent: 16h 40m (was: 16.5h)
> Go triggering support
> ---------------------
>
> Key: BEAM-3304
> URL: https://issues.apache.org/jira/browse/BEAM-3304
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Henning Rohde
> Priority: P3
> Time Spent: 16h 40m
> Remaining Estimate: 0h
>
> `Add support for triggers.
> [https://beam.apache.org/documentation/programming-guide/#triggers]
> Triggers are special runner side behavior indicating how to handle data WRT
> the watermark and window. Commonly configuring the processing for “late data”
> and similar.
> These are not currently implemented for user use in the Go SDK. Reshuffle
> configures triggers, but it’s not accessible. A correct trigger
> implementation can at least re-implement Reshuffle in a user pipeline, rather
> than handled specially within the framework.
> * Requires extending the window package to be able to configure the various
> triggers.
> * Specifically being able to compose triggers as also permitted by the proto.
> **
> [https://github.com/apache/beam/blob/6e7b1c44bc7275ee047afc059fd610cd3f4e5bee/model/pipeline/src/main/proto/beam_runner_api.proto#L1111]
>
> * Requires updating the graphx package translate.go to marshal (and
> unmarshal?) the triggers to and from Beam PipelineProto Windowing strategies.
> * Requires supporting triggers with the beam.WindowInto transform for user
> pipeline use as well as complete documentation on its use from the user side.
> **
> [https://github.com/apache/beam/blob/6e7b1c44bc7275ee047afc059fd610cd3f4e5bee/sdks/go/pkg/beam/windowing.go]
>
> * Panes need to be decoded, otherwise triggering will cause runtime errors:
> [https://lists.apache.org/thread.html/r94c42d2d116f6464cd6b689543e5e578edf8310bf7c6e48a0958a56c%40%3Cdev.beam.apache.org%3E]
>
> * Handle pane propagation and observation in the exec package, and in user
> dofns.
> ** Panes indicate whether data was on time or not, and similar facets which
> may be relevant for processing.
> ** Might simply extend the existing window interface.
>
> Similar to windowing, many of the same places as
> https://issues.apache.org/jira/browse/BEAM-11100 need to be modified.
> At simplest though, it's mostly a runner side construction, with less concern
> on the exec side, and generally much simpler.
> Appropriate integration tests against portable runners must be implemented:
> [https://github.com/apache/beam/tree/master/sdks/go/test/integration/primitives]
>
> And optionally add support for the configurable triggers to the the Go Direct
> Runner. However, the results must be compared and validated against a
> semantically correct runner like the python portable runner first. At
> minimum, the Go Direct Runner should be made aware of triggers and produce a
> coherent error whenever there's a trigger it can't deal with.
>
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