What happened?

Introduced in #29616, OutputReceiver implementations now requires a new method outputWindowedValue to be implemented in subclasses.

Arguably this was already noticed as a breaking change in #29616, as multiple @Override public void outputWindowedValue(..) {throw new UnsupportedOperationException} was added in Beam code.

We should consider declare the interface method as a default method there

Issue Priority

Priority: 2 (default / most bugs should be filed as P2)

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