xishuaidelin commented on code in PR #26708:
URL: https://github.com/apache/flink/pull/26708#discussion_r2162910343


##########
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/join/lookup/keyordered/Epoch.java:
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@@ -72,6 +74,7 @@ public void setOutput(Consumer<StreamElementQueueEntry<OUT>> 
outputConsumer) {
 
     public void decrementCount() {
         ongoingRecordCount--;
+        Preconditions.checkState(ongoingRecordCount >= 0);

Review Comment:
   Current implementation works in the mailbox thread and it is not designed to 
work for multi-threads. Besides, this structure would be removed. The 
AsyncExecutionController in flink-runtime would be integrated into stream 
opeator as a generialized framework. 
   
   Based on this, I tend to have the current delta join operator and async key 
ordered lookup operator temporarily rely on this structure without deeper 
refactoring, since a more comprehensive refactoring will occur in the near 
future.



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