m1a2st commented on code in PR #17440:
URL: https://github.com/apache/kafka/pull/17440#discussion_r1858598236


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerNetworkThread.java:
##########
@@ -153,7 +154,16 @@ void runOnce() {
                 .map(rm -> rm.maximumTimeToWait(currentTimeMs))
                 .reduce(Long.MAX_VALUE, Math::min);
 
-        reapExpiredApplicationEvents(currentTimeMs);
+        List<CompletableEvent<?>> completableEvents = 
reapExpiredApplicationEvents(currentTimeMs);
+        
+        // If there is a metadata error, complete the completable events which 
are not passed by error event with the metadata error
+        if (networkClientDelegate.metadataError().isPresent()) {
+            Throwable metadataError = 
networkClientDelegate.metadataError().get();
+            completableEvents.stream()
+                    .filter(event -> !(event instanceof 
CompletableApplicationEvent && ((CompletableApplicationEvent<?>) 
event).isPassedByErrorEvent()))
+                    .forEach(event -> 
event.future().completeExceptionally(metadataError));
+            networkClientDelegate.clearMetadataError();

Review Comment:
   I don't think it's necessary to execute `maybeFailOnMetadataError` before 
`applicationEventProcessor.process(event)`. Because, under normal situation, 
metadata errors only occur during the processing of events. Therefore, checking 
for metadata errors before processing is unnecessary.
   WDYT?



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