lucasbru commented on code in PR #14920:
URL: https://github.com/apache/kafka/pull/14920#discussion_r1417484146
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
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@@ -957,6 +966,57 @@ private void close(Duration timeout, boolean
swallowException) {
}
}
+ /**
+ * Prior to closing the network thread, we need to make sure the following
operations happen in the right sequence:
+ * 1. autocommit offsets
+ * 2. revoke all partitions
+ */
+ private void prepareShutdown(final Timer timer) {
+ if (!groupMetadata.isPresent())
+ return;
+
+ maybeAutoCommitSync(timer);
+ timer.update();
+ if (!subscriptions.hasAutoAssignedPartitions() ||
subscriptions.assignedPartitions().isEmpty())
+ return;
+
+ try {
+ // If the consumer is in a group, we will pause and revoke all
assigned partitions
+ onLeavePrepare().get(timer.remainingMs(), TimeUnit.MILLISECONDS);
+ timer.update();
+ } catch (Exception e) {
+ Exception exception = e;
+ if (e instanceof ExecutionException)
+ exception = (Exception) e.getCause();
+ throw new KafkaException("User rebalance callback throws an
error", exception);
+ } finally {
+ subscriptions.assignFromSubscribed(Collections.emptySet());
+ }
+ }
+
+ private void maybeAutoCommitSync(final Timer timer) {
+ if (autoCommitEnabled) {
+ Map<TopicPartition, OffsetAndMetadata> allConsumed =
subscriptions.allConsumed();
+ try {
+ log.debug("Sending synchronous auto-commit of offsets {} on
closing", allConsumed);
+ commitSync(allConsumed,
Duration.ofMillis(timer.remainingMs()));
+ } catch (Exception e) {
+ // consistent with async auto-commit failures, we do not
propagate the exception
+ log.warn("Synchronous auto-commit of offsets {} failed: {}",
allConsumed, e.getMessage());
+ }
+ }
+ }
+
+ private CompletableFuture<Void> onLeavePrepare() {
+ SortedSet<TopicPartition> droppedPartitions = new
TreeSet<>(MembershipManagerImpl.TOPIC_PARTITION_COMPARATOR);
+ droppedPartitions.addAll(subscriptions.assignedPartitions());
+ if (!subscriptions.hasAutoAssignedPartitions() ||
droppedPartitions.isEmpty()) {
+ return CompletableFuture.completedFuture(null);
+ }
+ // TODO: Invoke rebalanceListener via KAFKA-15276
+ return CompletableFuture.completedFuture(null);
+ }
+
Review Comment:
Several people seem to agree that we should solve this as much as possible
via an event. Is the new draft PR going to replace this PR, or should we try to
merge this one?
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