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https://issues.apache.org/jira/browse/BEAM-11928?focusedWorklogId=653152&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-653152
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ASF GitHub Bot logged work on BEAM-11928:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Sep/21 19:07
Start Date: 20/Sep/21 19:07
Worklog Time Spent: 10m
Work Description: jrmccluskey commented on pull request #15400:
URL: https://github.com/apache/beam/pull/15400#issuecomment-923200852
It first came up in the initial TestStream implementation, it's something
with how Flink is setting up its environment. We asked around when TestStream
was first submitted and no one seemed to know, which is why those tests were
generally not enabled. Seems to be machine specific, impacting places like
Jenkins but passing on other machines without issue.
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Issue Time Tracking
-------------------
Worklog Id: (was: 653152)
Time Spent: 4h 20m (was: 4h 10m)
> Go SDK should use the combine_globally urn for global combines.
> ---------------------------------------------------------------
>
> Key: BEAM-11928
> URL: https://issues.apache.org/jira/browse/BEAM-11928
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Jack McCluskey
> Priority: P3
> Time Spent: 4h 20m
> Remaining Estimate: 0h
>
> Reported on
> [https://stackoverflow.com/questions/66446338/issue-with-combine-function-in-apache-beam-go-sdk/66486052#66486052]
> The root is that the Go SDK doesn't use the
> "beam:transform:combine_globally:v1" URN, and always uses
> "beam:transform:combine_per_key:v1" even for global combines, with a
> AddFixedKey DoFn.
> URN in the proto:
> [https://github.com/apache/beam/blob/master/model/pipeline/src/main/proto/beam_runner_api.proto#L347]
>
> Go SDK only having combine_per_key
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/graphx/translate.go#L42]
> We currently "detect" combines via a CombinePerKey scope
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/graph/edge.go#L434]
>
> added at beam.TryCombinePerKey
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/combine.go#L58]
> We convert combines into the CombinePayload here
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/graphx/translate.go#L253]
> called above here:
> [https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/core/runtime/graphx/translate.go#L241]
>
> We probably want to just add a graph.CombineGlobal op ( vs the existing
> combine node), or modify the "CombinePerKey" scope hack to have a
> CombineCombineGlobal variant, or somehting that is cleaner than currently
> exists.
> We'd also want to make sure the optimization takes place properly, which
> should be simple enough to detect timing wise at least once, if not as a
> regular benchmark.
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