brandboat commented on code in PR #18089:
URL: https://github.com/apache/kafka/pull/18089#discussion_r1881981040
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractMembershipManager.java:
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@@ -1175,21 +1175,8 @@ private CompletableFuture<Void> assignPartitions(
// Invoke user call back.
CompletableFuture<Void> result =
signalPartitionsAssigned(addedPartitions);
- result.whenComplete((__, exception) -> {
- if (exception == null) {
- // Enable newly added partitions to start fetching and
updating positions for them.
-
subscriptions.enablePartitionsAwaitingCallback(addedPartitions);
- } else {
- // Keeping newly added partitions as non-fetchable after the
callback failure.
- // They will be retried on the next reconciliation loop, until
it succeeds or the
- // broker removes them from the assignment.
- if (!addedPartitions.isEmpty()) {
- log.warn("Leaving newly assigned partitions {} marked as
non-fetchable and not " +
- "requiring initializing positions after
onPartitionsAssigned callback failed.",
- addedPartitions, exception);
- }
- }
- });
+ // Enable newly added partitions to start fetching and updating
positions for them.
+ result.whenComplete((__, exception) ->
subscriptions.enablePartitionsAwaitingCallback(addedPartitions));
Review Comment:
> that's true in the app thread, but the risk is that with the new consumer
the fetching happens in the background thread, so I wonder if by enabling the
partition when the callback failed (and hasn't recovered) we could end up in a
weird situation sending a fetch request in the background? It's not
conceptually right.
Sorry I didn't notice this part, yes it's weird that fetch request still
triggered even if callback failed, that is also something never happened in the
classic consumer. I should be more careful :(
I'll address comments above and add more tests later, thank you all !
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