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https://issues.apache.org/jira/browse/BEAM-11398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17315666#comment-17315666
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Robert Burke commented on BEAM-11398:
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The Go SDK has only the one CoGBK test which "reiterates", but since there's no
(permitted) way for the user to re-set the iterator, the reiterations aren't
going to do anything, and it'll just fail to emit.
[https://github.com/apache/beam/blob/master/sdks/go/test/load/cogbk/cogbk.go#L57]
Granted, because of the way CoGBKs are implemented (on top of a single GBK),
there is technically system driven re-iteration happening with the 2nd set of
values.
> #1 CoGBK Go load test is too slow
> ---------------------------------
>
> Key: BEAM-11398
> URL: https://issues.apache.org/jira/browse/BEAM-11398
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-go, testing
> Reporter: Kamil Wasilewski
> Priority: P3
>
> One of the CoGBK load test cases, which involves a PCollection of 2GB of data
> with a single key, takes much longer to be processed than the rest. This
> happens for Go SDK and Flink.
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