Heejong Lee created BEAM-7220:
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             Summary: add JavaReadViaImpulse substitution to Java expansion 
service
                 Key: BEAM-7220
                 URL: https://issues.apache.org/jira/browse/BEAM-7220
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Heejong Lee


Read transform is not supported in the portability framework. `PortableRunner` 
substitutes Read transform with Impulse + DoFn before it submits a pipeline to 
JobServer. However, when ExternalTransform is used, this substitution logic 
doesn't work. Looks like it should be doneĀ in the expansion service instead 
until we completely remove JavaReadViaImpulse hack.



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