egalpin commented on issue #21162:
URL: https://github.com/apache/beam/issues/21162#issuecomment-1370113175

   This is indeed correct usage, and I was under the impression that this 
should work. Based on what you're saying/seeing, I'm suspicious that the coder 
might not be propagated through the PubsubIO/write code path.  I'll try to 
trace the code to confirm and/or validate behaviour as well.
   
   @codertimu you could try to set the default coder for the pubsub message 
class[1] to see if that will unblock you: 
   
   ```java
   PipelineOptions options = PipelineOptionsFactory.create();
   Pipeline p = Pipeline.create(options);
   
   CoderRegistry cr = p.getCoderRegistry();
   cr.registerCoder(PubsubMessage.class, 
PubsubMessageWithAttributesAndMessageIdAndOrderingKeyCoder.class);
   ```
   
   [1] 
https://beam.apache.org/documentation/programming-guide/#setting-default-coder


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