hachikuji commented on a change in pull request #7222:
URL: https://github.com/apache/kafka/pull/7222#discussion_r467143222



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/Fetcher.java
##########
@@ -1120,17 +1123,28 @@ Node selectReadReplica(TopicPartition partition, Node 
leaderReplica, long curren
         }
     }
 
+    /**
+     * If we have seen new metadata (as tracked by {@link 
org.apache.kafka.clients.Metadata#updateVersion()}), then
+     * we should check that all of the assignments have a valid position.
+     */
+    private void maybeValidateAssignments() {

Review comment:
       The name here threw me off because of its generality. I think we need to 
work metadata into the name to make it clearer. Maybe 
`validatePositionsOnMetadataChange` or `validatePositionsForLeaderChanges`.




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