I would like to know if the RUN ID generated by SWF is unique across the board or is it unique only to a domain + workflow id combination. Essentially, if I want to store workflow status and other meta data outside of SWF, will it be prudent to key that data off by run id or do I need a composite consisting of domain and workflow id?
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According to SWF API Reference it is guaranteed to be unique within a domain.
The runId of a workflow execution. This Id is generated by the service and can be used to uniquely identify the workflow execution within a domain.
So use domain, runId as your external datastore key.
Maxim Fateev
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