echauchot commented on pull request #15148:
URL: https://github.com/apache/beam/pull/15148#issuecomment-877190015


   Oops, just putting the SS runner sources back to main spark src folder only 
works for spark 2 but for spark 3 it doesn't as the spark 3 module inheritates 
the spark 2 related sources from main src folder and DataSourceV2 spark API is 
not available for Spark 3.
   
   Ideal would be to figure out the equivalent of spark 2 DataSourceV2 API for 
spark 3 but I fear there is more incompatibilities with spark 3. Maybe a gradle 
specific conf for spark 2 module would be good.


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