m1a2st commented on code in PR #17440:
URL: https://github.com/apache/kafka/pull/17440#discussion_r1874197149
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/NetworkClientDelegate.java:
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@@ -150,7 +155,11 @@ private void maybePropagateMetadataError() {
try {
metadata.maybeThrowAnyException();
Review Comment:
My observation is that when we encounter a metadata error, the application
thread does not immediately execute a new event, so the background thread
continues to execute `runOnce`. During the next execution of `runOnce`, the
metadata error gets cleared, resulting in the event not being propagated.
As for the event, when it throws a `TopicAuthorizationException`, it is
already considered complete by `completeExceptionally`, so this event is not
counted among the uncompleted ones. Make sense?
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