DavidLiu001 commented on code in PR #22241:
URL: https://github.com/apache/flink/pull/22241#discussion_r1148340558


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flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/sink/throwable/FatalExceptionClassifier.java:
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@@ -44,6 +44,8 @@ public FatalExceptionClassifier(
     public boolean isFatal(Throwable err, Consumer<Exception> 
throwableConsumer) {
         if (validator.test(err)) {
             throwableConsumer.accept(throwableMapper.apply(err));
+            return true;
+        } else {

Review Comment:
   > > > Dont think we should return `false` right after validator.test is 
`false` as it wont go into `chainedClassifier` check. Instead, we should return 
false at the line 55.
   > > > Good comment, PR was updated.  A little difference, 
`chainedClassifier` check includes `false` and `true`,  It seems that new 
"return false" is not needed.
   > 
   > If we carry on to `chainedClassifier` check, the result is being `false`, 
isn't it? so if there is nothing to check from `chainedClassifier` 
(`chainedClassifier` is `null`), shouldn't we return `false`?
   
   Good discussion.  Since `chainedClassifier` is a private memeber of 
`FatalExceptionClassifier` and when a chain is created, there is  
`chainedClassifier` to be used, if `chainedClassifier` is `null`, it can cause 
fatal exception.  When `chainedClassifier` is `null`, do you think we should 
return `false` not `true` ?  



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