dmvk commented on a change in pull request #13353:
URL: https://github.com/apache/beam/pull/13353#discussion_r524545316



##########
File path: 
runners/flink/src/main/java/org/apache/beam/runners/flink/translation/wrappers/streaming/WorkItemKeySelector.java
##########
@@ -49,6 +52,6 @@ public ByteBuffer 
getKey(WindowedValue<SingletonKeyedWorkItem<K, V>> value) thro
 
   @Override
   public TypeInformation<ByteBuffer> getProducedType() {
-    return new GenericTypeInfo<>(ByteBuffer.class);
+    return new CoderTypeInformation<>(FlinkKeyUtils.ByteBufferCoder.of(), 
pipelineOptions.get());

Review comment:
       Not sure if this is necessary. I wanted to ensure that the new 
"reinterpreted partitioning" is compatible with the one used by GBK / Combine.
   
   The idea was if partitioning is not compatible, it may result in some state 
partitioning related glitches (eg. you wouldn't have local state for a 
key-group you need).
   
   Second thoughts, flink selects target partition based on "pojo hash code" 
(not based on binary representation), so the previous version was probably 
compatible enough 🤔 
   
   @mxm WDYT?




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