mumrah commented on code in PR #13802:
URL: https://github.com/apache/kafka/pull/13802#discussion_r1219833727
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metadata/src/main/java/org/apache/kafka/metadata/migration/KRaftMigrationZkWriter.java:
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@@ -267,6 +267,9 @@ void handleTopicsDelta(
) {
topicsDelta.deletedTopicIds().forEach(topicId -> {
String name = deletedTopicNameResolver.apply(topicId);
+ if (name == null) {
Review Comment:
I ran into a NPE here in my test code when I passed an empty map.
In the production code, the function passed in here the getter of
`topicsById` map in TopicsImage. I think it's impossible for there to be
something in `deletedTopicIds` that's not also in `topicsById`. This check
isn't really necessary, but the custom RuntimeException is better than an NPE
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