chia7712 commented on code in PR #20283:
URL: https://github.com/apache/kafka/pull/20283#discussion_r2319988221
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/ShareConsumerImpl.java:
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@@ -1116,19 +1116,23 @@ private boolean processBackgroundEvents() {
LinkedList<BackgroundEvent> events = new LinkedList<>();
backgroundEventQueue.drainTo(events);
+ if (!events.isEmpty()) {
Review Comment:
`BackgroundEventHandler#drainEvents` is not used, so the metrics
`background-event-queue-size` is never reset to zero. One option could be to
call `asyncConsumerMetrics.recordBackgroundEventQueueSize(0)` manually.
Alternatively, `ShareConsumerImpl` could use `BackgroundEventHandler` instead
of `backgroundEventQueue`, similar to `AsyncKafkaConsumer`
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