Eugene Kirpichov created BEAM-1979:
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             Summary: Outputting to an undeclared side output TupleTag should 
throw
                 Key: BEAM-1979
                 URL: https://issues.apache.org/jira/browse/BEAM-1979
             Project: Beam
          Issue Type: Bug
          Components: runner-dataflow
            Reporter: Eugene Kirpichov
            Assignee: Eugene Kirpichov


Currently some runners (perhaps all of them?..), when you output to a side 
output tag that wasn't passed to ParDo.withOutputTags, simply drop the data on 
the floor (or increase some aggregators).

Silent data dropping is never okay, and it's never okay to output to an 
undeclared tag. So instead this should throw.



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