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https://issues.apache.org/jira/browse/BEAM-14512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17550034#comment-17550034
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Danny McCormick commented on BEAM-14512:
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This issue has been migrated to https://github.com/apache/beam/issues/21604
> Add TO_STRING capability to Go SDK
> ----------------------------------
>
> Key: BEAM-14512
> URL: https://issues.apache.org/jira/browse/BEAM-14512
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Priority: P2
>
> Go SDK doesn't yet implement TO_STRING, which is necessary for runner hotkey
> debugging among other things.
> URN description:
> https://github.com/apache/beam/blob/master/model/pipeline/src/main/proto/org/apache/beam/model/pipeline/v1/beam_runner_api.proto#L329
> Involves adding the capability URN "beam:transform:to_string:v1" to the
> goCapabilities list in graphx/translate.go and the paired handling in
> exec/translate.go along with the appropriate node to convert elements to
> strings using fmt.
> Using fmt allows user element types to have String() implemented, which will
> then appear as normal. However, we should also print out the %T for the type,
> to make it unambiguous for users to know the type of the hot key, which will
> reduce debugging turn around.
> AFAIK only used with Dataflow when "Hot Key Logging"
> https://cloud.devsite.corp.google.com/dataflow/docs/reference/pipeline-options#debugging
> is enabled, and there's no closed form runner test for this at present.
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