Zakelly commented on code in PR #25367:
URL: https://github.com/apache/flink/pull/25367#discussion_r1770746753


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flink-runtime/src/main/java/org/apache/flink/runtime/asyncprocessing/AsyncExecutionController.java:
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@@ -189,6 +194,9 @@ public RecordContext<K> buildContext(Object record, K key) {
      */
     public void setCurrentContext(RecordContext<K> switchingContext) {
         currentContext = switchingContext;
+        if (switchContextListener != null) {

Review Comment:
   If we keep a empty listener here instead of a `null`, the influence on the 
hot path for `async` is similar (`if` vs. a method call). For sync path (a 
rocksdb wrapped with adaptor), the `setCurrentContext` will be only invoked 
once, since the context switch is skipped for any callbacks of 
`CompletedStateFuture`. Thus the influence is minor, I'd prefer keeping it.



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