AndrewJSchofield commented on code in PR #15215:
URL: https://github.com/apache/kafka/pull/15215#discussion_r1459040148
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
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@@ -1134,9 +1134,22 @@ private CompletableFuture<Void> assignPartitions(
// Make assignment effective on the client by updating the
subscription state.
updateSubscription(assignedPartitions, false);
+ // Pause partitions to ensure that fetch does not start until the
callback completes.
+ assignedPartitions.forEach(tp ->
subscriptions.pause(tp.topicPartition()));
Review Comment:
I agree with this comment. There is a `KafkaConsumer.paused` method which
would show that we had paused the partitions internally, and that seems
incorrect in this case. They are logically not paused, but practically we are
not fetching records until the callback has been completed.
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