Warn at job submit time if a step is named with a / or empty in DataflowRunner
Open
dataflow
improvement
P3
runners
- Dominant language
- Java
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Description
When a job with an empty step name or a step name that has a "/" in it, it quietly breaks the job graph in the Dataflow UI. We should at least warn the user at job submit time.
Imported from Jira [BEAM-7957](https://issues.apache.org/jira/browse/BEAM-7957). Original Jira may contain additional context.
Reported by: davidyan.
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