xishuaidelin commented on PR #26015:
URL: https://github.com/apache/flink/pull/26015#issuecomment-2601256414

   1. The reason for the +U message is that among the 4 concurrent tasks, one 
task's initialization is delayed. During 
KeyedUpsertingSinkFunction#initializeState, the raw value of rawResult is 
placed into upsertResult.
   
   2. The ArrayBuffer issue could be resolved by explicitly converting it to a 
List in scala.


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