robertwb commented on PR #21782:
URL: https://github.com/apache/beam/pull/21782#issuecomment-1151756221

   I don't think this is the right direction either. If an external transform 
needs a certain set of files, that transform should be responsible for making 
the declaration, not the callee (and especially, it seems, the callee from 
another language). 
   
   I think the correct solution is to us resource hints (e.g. 
https://beam.apache.org/documentation/runtime/resource-hints/). There's also 
the issue of finding the resources at their new locations (on the worker). 
Presumably one would ask for a resource (e.g. file) to be staged against some 
kind of identifier, and on the worker one could use this identifier to look up 
the copied resource in its final destination. 


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