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https://issues.apache.org/jira/browse/BEAM-1850?focusedWorklogId=523493&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-523493
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ASF GitHub Bot logged work on BEAM-1850:
----------------------------------------
Author: ASF GitHub Bot
Created on: 12/Dec/20 22:27
Start Date: 12/Dec/20 22:27
Worklog Time Spent: 10m
Work Description: dmvk opened a new pull request #13540:
URL: https://github.com/apache/beam/pull/13540
https://issues.apache.org/jira/browse/BEAM-1850
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 523493)
Remaining Estimate: 0h
Time Spent: 10m
> Improve interplay between PushbackSideInputRunner and
> GroupAlsoByWindowViaWindowSetDoFn
> ---------------------------------------------------------------------------------------
>
> Key: BEAM-1850
> URL: https://issues.apache.org/jira/browse/BEAM-1850
> Project: Beam
> Issue Type: Improvement
> Components: runner-core, runner-flink
> Reporter: Aljoscha Krettek
> Priority: P3
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This originated from a discussion on a PR:
> https://github.com/apache/beam/pull/2235
> {{GroupAlsoByWindowViaWindowSetDoFn}}/{{GroupAlsoByWindowViaWindowSetNewDoFn}}
> and {{PushbackSideInputDoFnRunner}} don't work well together and we manually
> need to explode windows in
> {{FlinkStreamingTransformTranslators.ToKeyedWorkItem}} because of this:
> - {{GroupAlsoByWindowViaWindowSetDoFn}} is a {{DoFn<KeyedWorkItem<K,
> InputT>, KV<K, OutputT>>}} so you have to push in {{KeyedWorkItem}}. These
> themselves contain {{WindowedValue<InputT>}} (or timers).
> - For executing a {{DoFn}} we use a {{DoFnRunner}}. For our problem the
> interesting case is using a {{PushbackSideInputDoFnRunner}}. The interesting
> method is {{processElementInReadyWindows(WindowedValue<InputT> elem)}} where
> {{InputT}} is the input type of the {{DoFn}} which, for the windowing case,
> is {{KeyedWorkItem<K, InputT>}} (from above). The actual expanded type
> signature is thus
> {{processElementInReadyWindows(WindowedValue<KeyedWorkItem<K, InputT>>
> elem)}} where the keyed work items again contain {{WindowedValues}} (again,
> from above).
> I think the {{PushbackSideInputDoFnRunner}} was not initially meant for
> executing {{GroupAlsoByWindowViaWindowSetDoFns}}.
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