Robert Burke created BEAM-14512:
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Summary: 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
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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