jectpro7 commented on code in PR #24698:
URL: https://github.com/apache/flink/pull/24698#discussion_r1576511469


##########
flink-core/src/main/java/org/apache/flink/core/state/StateFutureImpl.java:
##########
@@ -61,23 +66,34 @@ public <U> StateFuture<U> thenApply(Function<? super T, ? 
extends U> fn) {
                 return StateFutureUtils.completedFuture(r);
             } else {
                 StateFutureImpl<U> ret = makeNewStateFuture();
-                completableFuture.thenAccept(
-                        (t) -> {
-                            callbackRunner.submit(
-                                    () -> {
-                                        ret.complete(fn.apply(t));
-                                        callbackFinished();
-                                    });
-                        });
+                completableFuture
+                        .thenAccept(
+                                (t) -> {
+                                    callbackRunner.submit(
+                                            () -> {
+                                                ret.complete(fn.apply(t));
+                                                callbackFinished();
+                                            });
+                                })
+                        .exceptionally(
+                                (e) -> {
+                                    exceptionHandler.handleException(

Review Comment:
   Shall we allow the handler return something (e.g. default fallback value)? 
if the execption is recoveryable, we can continue the operation. This behaviour 
also matched the `exceptionally` function.



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