TheNeuralBit commented on a change in pull request #11314: [BEAM-9562] Send
Timers over Data Channel as Elements
URL: https://github.com/apache/beam/pull/11314#discussion_r405831920
##########
File path:
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/ParDoTranslation.java
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@@ -257,6 +230,19 @@ public static ParDoPayload translateParDo(
restrictionCoderId = "";
}
+ Coder<BoundedWindow> windowCoder =
+ (Coder<BoundedWindow>)
mainInput.getWindowingStrategy().getWindowFn().windowCoder();
+ Coder<?> keyCoder;
+ if (signature.usesState() || signature.usesTimers()) {
+ checkArgument(
+ mainInput.getCoder() instanceof KvCoder,
+ "DoFn's that use state or timers must have an input PCollection with
a KvCoder but received %s",
+ mainInput.getCoder());
Review comment:
Just curious: did we not have this check before, and just failed when
attempting to cast to KVCoder (in the removed block from `translate` above)?
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